JPH08261354A - Opening closing indicating device for gate valve - Google Patents

Abstract

PURPOSE: To provide an opening closing indicating device which is so constituted as to simplify mounting of the device on an existing gate valve and besides reduce size. CONSTITUTION: A mounting frame 5 is attached to the handle support frame 4 of a gate valve A, a worm 8 is pivotally arranged at the mounting frame 5, and a gear-form transmission disc 9 is securely fitted in the upper end of the worm 8. A transmission pin 11 to intermittently rotate a transmission disc 9 is mounted on the hub 2 of a handle 1, and working pieces 16 and 17 to open and close a switch 18 are mounted on a worm wheel 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for indicating the open / closed state of a gate valve with a lamp or the like, which can be easily attached to an existing gate valve.

[0002]

2. Description of the Related Art In a plant that handles a large amount of fluid, it is necessary to constantly monitor the open / closed state of a gate valve incorporated in the plant in a control room or the like in order to operate the plant normally.

Normally, the gate valve is designed to open and close by opening and closing the valve body by rotating a handle connected to the stem.

There are two types of stems, an external screw type and an internal screw type. In the former, the stem is screwed into a screw hole to be provided in the handle support frame, and when the stem moves up and down with rotation, the stem The valve element that is locked to is also movable up and down.In the latter, the internal thread of the stem is screwed onto the male threaded rod that is integral with the valve element, and when the stem rotates, the male threaded rod is It is designed to go up and down along the inner thread of the stem.

However, in order to indicate the degree of opening / closing of the valve element, in the case of an externally threaded stem, based on the amount of elevation of the operator engaged with the external thread of the stem, In this case, the indicating means is actuated based on the rotation amount of the handle, but in the former case, the means for enlarging the raising / lowering amount of the stem is required, resulting in a large size, and it is difficult to ensure accuracy. Since the amount of rotation of the handle for opening and closing the valve body is extremely large, it is necessary to provide a large speed reducer such as a spur gear.

[0006]

As described above, by the axial displacement of the operator due to the rotation of the stem, or by taking out the many rotations of the stem by the speed reducing means such as a spur gear, a required instruction is given. When trying to do so, the pointing device is inevitably long or large.

Further, in order to attach the valve body opening / closing instruction device to the existing gate valve, it is necessary to remove the handle once and perform required processing and attachment of parts, which is troublesome and the plant must be temporarily operated. It is inconvenient because it has to be stopped.

An object of the present invention is to provide a gate valve opening / closing instruction device which can be mounted safely and easily during operation of a plant provided with a gate valve, and which is small in size and simple in construction.

[0009]

According to the present invention, a worm parallel to a stem is pivotally mounted on a mounting frame detachably mounted on a handle support frame of a gate valve, and a radial direction is provided at an end of the worm. Is provided with a gear-shaped transmission disc having a large number of engaging projections that face each other, the handle is parallel to the stem, and a transmission pin that engages with the transmission disc according to the rotation of the handle is attached, and to the worm, The above-mentioned problems are solved by meshing the worm wheel with the actuating piece facing in the radial direction.

[0010]

When the handle is rotated to open and close the valve body of the gate valve, the transmission pin that rotates together with the handle rotates the transmission disc that engages at every constant rotation of the handle by one protrusion. Then, the worm is rotated at a low speed in the direction opposite to the handle. Therefore, the worm wheel meshing with the worm is further decelerated and rotated, and the drive piece thereof operates the switch and the like when the valve body is fully closed and fully opened.

If the mounting frame and the transmission pin in which the respective members are built in advance are mounted on the gate valve in the operating plant, the opening / closing of the gate valve can be automatically instructed, and when it becomes unnecessary, the plant It can be easily removed while driving.

[0012]

1 and 2 show a general gate valve, (1) is a handle fixed to the upper end of a vertical stem (3), and (2) is a handle (1). Hub of (4)
Is a handle support frame forming a part of the gate valve (A).

On the right side of the handle support frame (4), a case-shaped mounting frame (5) is preliminarily mounted with the following members.
However, it is detachably attached. That is, the mounting frame
(5) has a vertical support plate (6) at the left end, and this support plate (6)
The mounting frame (5) is removably attached by fastening it to the support frame (4) with a U-shaped bolt (7).

As shown in FIGS. 3 and 4, a worm (8) which is parallel to the stem (3) is pivotally provided in the mounting frame (5) and projects from the mounting frame (5). ) At the top
The transmission disc (9) is fitted and fixed. The transmission disc (9) is
A large number of engaging projections (10), which are oriented in the radial direction, are formed on the periphery of the gear in a protruding manner at equal intervals.

On the lower surface of the hub (2) of the handle (1),
A support piece (12) which is integrated with a transmission pin (11) facing downward is detachably fixed by two U-shaped bolts (13).
Thus, the transmission pin (11) is at a position where it can interfere with the engaging projection (10) on the transmission disc (9).

A mounting frame for a pivot shaft (15) of a vertical worm wheel (14) pivotally supported by the mounting frame (5) and meshing with the worm (8).
A first actuating piece (16) and a second actuating piece (17) having a required relational angle are fixed to the protruding portion from (5).

In the mounting frame (5), both of the above operating pieces (16) (17)
An electric switch (18) that opens and closes by turning the lever (18a) by means of which the lamp (not shown) blinks.
Is installed. The first and second actuating pieces (16) (17), the transmission disc (9), etc. are covered with a protective cover (19).

In the above-mentioned device of the present invention, the gate valve
When the handle (1) is rotated to open and close the valve body of (A), the worm (8) moves through the transmission disc (9) by the transmission pin (11) which rotates with it. ) Revolving in the opposite direction to the handle (1) intermittently at a significantly slower speed.

Then, the worm wheel (14) is
Rotating at a lower speed than (8), the first operating piece (16) is a switch
When the lever (18a) of (18) is pushed up, the lamp lights up, and when the second operating piece (17) pushes down the lever (18a), the lamp goes out.

The apparatus of the present invention described above can be mounted and removed by attaching and detaching both U-shaped bolts (7) and (13) even during plant operation.
At the same time, it can be easily attached to and detached from the gate valve (A).

In the above embodiment, the transmission pin
Although (11) is one, depending on the size and purpose of use of the gate valve (A), there may be two or more transmission pins (11) or the pitch between the worm (8) and the worm wheel (14) may be changed. As a result, the opening / closing interval of the switch (18) can be adjusted.

[0022]

EFFECTS OF THE INVENTION (a) Because the interaction between the transmission pin and the transmission disc reduces the rotation speed of the worm to a greater extent than the steering wheel, and the worm and the worm wheel reduce the rotation speed of both drive pieces to a greater extent than the worm. Even if the handle is rotated many times to open and close the gate valve, the amount of rotation can be taken out as a slight rotation of the pivot of the worm wheel. Therefore, the device can be remarkably downsized as compared with the conventional device in which the rotation amount of the stem is taken out as the axial displacement.

(B) Since the mounting frame and the transmission pin in which most of the members are incorporated in advance may be mounted on the handle support frame and the hub of the handle respectively, the gate valve installed in the plant can be operated without any trouble during operation. It can be attached and removed safely and easily.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a gate valve to which the present invention has been applied.

FIG. 2 is a left side view of FIG.

FIG. 3 is a front view of a central longitudinal section of the device of the present invention with some parts omitted.

4 is a vertical cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 (1) Handle (2) Bab (3) Stem (4) Handle support frame (5) Mounting frame (6) Support plate (7) U-shaped bolt (8) Worm (9) Transmission disk (10) Engagement protrusion (11) Transmission pin (12) Support piece (13) U-shaped bolt (14) Worm wheel (15) Axis (16) 1st operating piece (17) 2nd operating piece (18) Switch (18a) Lever (19) Protective cover

Claims (3)

[Claims] 1. A worm, which is parallel to a stem, is pivotally mounted on a mounting frame detachably mounted on a handle support frame of a gate valve, and a plurality of engaging projections directed in a radial direction are provided at an end of the worm. A gear-shaped transmission disc is provided, and a handle is provided with a transmission pin that is parallel to the stem and that engages with the transmission disc as the handle rotates.
An opening / closing instruction device for a gate valve, characterized in that a worm wheel having an actuating piece facing in a radial direction is meshed with the worm. 2. The opening / closing instruction device for a gate valve according to claim 1, wherein the actuating piece actuates the instruction switch at an angle corresponding to opening / closing of the valve body of the gate valve. 3. The opening / closing instruction device for a gate valve according to claim 1, wherein the operating piece is composed of a pair corresponding to full opening and full closing of the valve body of the gate valve.