JP2005180529A - Locking device of valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handle device having an operation locking mechanism without altering a valve body, in a handle device for opening and closing a valve. <P>SOLUTION: This locking device includes: a handle part 22 for performing operation and a driving part 14 engaged with an operating shaft part of the valve, wherein circular-arc grooves 30, 17 are provided in a joint part between the handle part 22 and the driving part 14, balls 37 are disposed in the circular-arc groove, the handle part 22 and the driving part 14 are freely rotated and the free rotation is inhibited by use of a cam by the operation of a key device 32. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a valve lock having a valve body and a rotatable operating portion protruding therefrom.

  Although the application is not limited, the present invention particularly relates to a locking device for an industrial fluid flow control valve, and the industrial fluid control valve is a valve used in a chemical plant, an oil refinery, a pipeline, or the like. It is.

  The most frequently used industrial fluid flow control valves have a diameter of 50 mm or more, and the purpose is to control the flow of fluid in the pipe. Serious damage can occur. There are many proposals for locking the valve, and the chain and padlock (the chain is passed through the handle and both ends fixed with a padlock) are simple, and there are many relatively sophisticated locks and types dedicated to the valve. In the case of the latter exclusive lock, it is important that no major modifications are made to the valve side to attach the lock. This is because modifications to the valve body may invalidate the valve manufacturer's warranty for the valve.

  A commonly recognized problem with locks for industrial fluid flow control valve locks that require additional machining on the valve side is the relatively low integrity.

  Such a device will prevent misoperation by unauthorized workers, but will not deter attempts to work without intentionally using locks. There is also a problem that it can be removed relatively easily for repair. In this case, once the lock is removed and the lock is not restored, anyone can operate the valve.

  The main object of the present invention is to enable a locking device for providing high security integrity to a valve attached to industrial piping.

  This locking device can prevent unauthorized personnel from operating the valve and prevent attempts to remove the locking device from the valve. Accordingly, it is an object of the present invention to cut a portion of the device with a special tool once the lock is installed, making it impossible to remove the device without destroying the device.

The invention makes it possible to provide a locking device for a valve body and a valve having a rotatable operating part protruding from the body.

  This device is composed of a drive part suitable for mounting an operation unit for the purpose of rotation, a rotary part attached coaxially with the drive part, and a key device (the key device is attached to the rotary part). .

The key device uses a key to stop rotation between the rotating portion and the drive portion, and is provided with a detent that selectively engages the drive portion by the key.

  As a characteristic feature of the present locking device, an arc-shaped groove having a partially circular cross section facing outward is formed in the driving portion, and the center of the groove is the same as the center of the driving portion. Similarly, an arc-shaped groove having a partially circular cross section is also formed in the rotating portion. The two opposite grooves are aligned in the axial direction.

  As a further feature, a plurality of ball balls are arranged so as to partially relate to the respective grooves. With the plurality of balls, the related movement in the axial direction between the rotating part and the driving part is stopped, and the rotation related to the rotating part and the driving part is made possible.

  Further, as a feature, the key device is provided with a groove and a portion that are aligned with each other in the axial direction, and has a role of holding ball balls.

In the locking device of the present invention, the rotating portion completely wraps the driving portion, or partially wraps the main body and the upper portion of the valve, and the entire locking device is obtained.

  The drive part is attached to the operation part, but the rotating nut acts as a rotating part when the valve stem rises.

The rotating part is coupled to the drive part by a ball, which is located across each groove.

The ball ball is held in the groove of the key device and can be made tough structure so that the ball cannot be removed without permission. The key device is attached to the rotating part semi-permanently and permanently, and it is extremely difficult to remove the key device. The only way to remove the rotating part is to remove the key device. That is, to remove the ball. Bolts with high maintenance safety can be used for mounting so that they cannot be removed.

  Desirably, the groove of the drive part is continuous and without interruption, and is surrounded by the rotating part.

  The aforementioned part of the key device is held in the arc-shaped groove of the ball ball rotating part by releasing the ends on both sides of the groove of the rotating part. Further, it engages with the corresponding portion of the groove of the drive portion regardless of the angle of the rotation portion with respect to the drive portion.

In other words, the key device itself determines an arc-shaped groove, and when the key device is attached to the rotating part, the length and shape of the arc groove facing the groove of the driving part is the circle of the arc-shaped groove of the rotating part. Matches.

Thus, the key device and the rotating part together constitute a continuous groove in the driving part.

The rotating part is provided with an opening in which the key device is housed in the form of a simple cylinder. For installation, high maintenance bolts, such as those without bolt heads, can be used. Bolts can be stored in the counterbore provided in the rotating part. Furthermore, the bolt with sheared head has a dome-shaped head, and cannot be removed by applying force with a pipe or tube, or by cutting with a drill. Other security and safety bolts can also be used.

  When the key is inserted, the cam rotates and engages a recess (concave) portion provided in the drive portion. The driving force is transmitted from the rotating portion to the driving portion with the key inserted. On the other hand, when the key is pulled out, the cam rotates and the cam comes off from the depression (concave). In this state, the rotating part can idle around the driving part.

  When the key is removed, it becomes locked and the rotating part can idle around the driving part, making it impossible to rotate the driving part. If the idling is ensured by holding the rotating part and the driving part on the same axis, the movement is not transmitted to the driving part. A further bearing can be provided between the rotating part and the driving part on the shaft away from the facing groove.

  Such a bearing is made of a low-friction ring, and the low-friction material can be made of phosphor bronze.

  This bearing is mounted either on the drive part or on the rotating part. Such a ring is mounted at the farthest part of the rotating part from the valve, and a hole is provided on the ring that fits the drive part.

In order to obtain a more preferable structure, a locking device can be attached to the lower side of the valve, but a skirt or a hook is provided on the rotating portion. This is to cover the top of the valve.

  Such a skirt or heel can be cut to an appropriate length prior to mounting the locking device, to minimize contact between the valve top and the drive portion inside.

As an example, one embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

  Figure 1 is an overall view of the lock, showing the overall view of the locking device attached to the valve that controls the industrial fluid flow, in which case the valve handle is partially cut away to make it look better. is there.

  FIG. 4 is an enlarged view of a part of the structure shown in FIG.

  5 and 6 are plan views, which are partial sectional views as indicated by symbols V-V and VI-VI in FIG.

  3 to 5, the locking device (10) is attached to a valve nut (11) that moves up and down the valve stem, and the upper part thereof is shown by a diagram in (12).

  The valve stem (13) of the valve is raised and lowered by the rotation of the nut (11), thereby opening and closing the valve as necessary.

  The only connection with the valve is via the nut (11). There is no modification to the valve other than removing the original valve handle from the nut.

  The locking device has a drive part (14) with an inner contour that conforms to the shape of the nut (11). As shown in the drawing, the nut (11) has a hexagonal outer shape.

  Usually the secondary nut (15) is used to tighten the handwheel to the nut (11), but in this embodiment the drive (14) is instead replaced by the secondary nut (15) to the nut (11). To fix.

  The drive part (14) is essentially cylinder-shaped and is formed with a flange (16) at its lower end, the circumference of which is a partial circular cross section with radially outward grooves (17). Is done.

  Three depressions (recesses) (19) are created above the cylinder wall (18) flange (16) of the drive part (14). This purpose is described below.

  The rotating part (21) is placed in rotation on the driving part (14). The rotating part has a hand wheel (22) having 2-3 spokes and is fixed by bolts (24) to the cylinder side wall of the rotating part as described below, as in the key device (32).

  As best seen in FIG. 3, each security bolt (24) has a hexagonal head and is connected to the body of the bolt by a stem 27.

  When the bolt is tightened with a wrench with a predetermined torque, the shaft (27) is sheared and the barrel (26) remains tightened.

  Since the head is lost and there is no surface on which the tool is caught, the body part of the bolt cannot be removed.

  1 and 2, as shown in FIGS. 1 and 2, the inner flange (29) (FIG. 3) is partly open to the cylindrical side wall (31) of the rotating part, except for the opening on the inner surface of the cylinder wall. The groove (30) formed in the part has a partially circular cross-sectional shape and faces the groove (17) in the drive part (14).

The key device (32) is attached to the opening on the side wall surface. This key device is housed between the side plates (33) and is permanently fixed to the wall surface (31), and further fixed to the position by a safety bolt (34). The safety bolt passes through the side plate (33) and is screwed into the screw portion in the key device (32).

As already mentioned, the safety bolt (34) is attached with the same number of similar bolts as (24), and when the bolt is tightened firmly, the bolt head is cut and the bolt is not removed.

  The key device (32) has a leg (35) coinciding with the flange (29) of the rotating part, the inwardly facing surface of the leg (35) is half-moon shaped and centered on the axis of the rotating part.

Yet another groove (36) is provided in the surface that is partly circular and that faces the inside of the leg (35). This other groove (36) coincides with the groove (30) of the rotating part and serves to make the groove continuous.

  A plurality of balls (37) enter a groove (17, 30, 36) in a line. These balls are held by a gauge (38), and the balls are received in the space between the drive part flange (16) and the rotary part flange (29) or the keying leg (35). Have common parts. This partial view is shown appropriately in FIG.

In this way, the rotating part is attached to the driving part, but the movement in the axial direction is suppressed.

A cover plate (40) is provided at the upper end of the rotating part (21). For example, the rotating part is welded at a position designed during manufacture.

  The cover plate (40) is supported on or above the phosphor bronze bearing ring (41), which is fixed by bolts (42).

  The bearing (41) receives the upper end of the drive part (14). Thereby, the rotating part (21) is kept in a common axis with the driving part and the valve stem (13) of the valve, and can rotate around the driving part (14).

  Machined into a suitable shape to fit snugly around the top (12) of the valve where the heel cover (43) is attached to the lower part of the rotating part (21). The heel cover and the locking device are integrated, and the heel cover (43) is fixed by a pin (44) which is knocked into a predetermined place by a hammer. Align with the holes made at the same interval around the rotating part to be driven. A suitable diameter cover is selected and cut to the appropriate length before the device is fitted to the valve. It is then attached to the rotating part with a pin (44). Once the pin is driven sufficiently, the pin (44) can no longer be removed and the heel cover (43) can be prevented from being removed.

The key device (32) is provided with a receiving port (46) for the plate key (47). The key board is of a known design.

The key can be unlocked by sliding it straight into the receiving port. The device is locked when the key is removed. This causes the rotating part to idle around the driving part in order to decouple the driving force between the rotating part (21) and the driving part (14), making it impossible to operate the valve.

  The key device is provided with a detent (49) for free movement, and when the key (47) is inserted into the receiving port, the detent (49) rotates to make the cam free of rotation.

When the key is further pushed in (not shown), the key teeth and the corresponding teeth of the cam engage. Thereby, the cam can be rotated and engaged or disengaged using lobes on the cam. This engagement refers to engagement with a recess (recess) (19) provided in the cylindrical wall of the drive part (14) (release of this engagement can be seen by the feel of the key movement).

The mechanism described above allows the locking device to operate at virtually any angle, and there are no operational problems including extreme movement.
The cams (50) can be engaged with each other with a recess (19) in the drive (14). However, when a part of the drive portion is coincident with the cam (50) between the depressions (concaves) (19) adjacent to each other, the mutual engagement becomes impossible.

The depression (concave) (19) is larger in size than the cam, the person who kept the angle has a hole, and both ends are rounded. This is for facilitating the engagement of one depression (recess) (19) with the cam (50). At the time of this switching, that is, when the device is unlocked and the rotating part and the driving part are connected, there is a slight waiting for movement between the rotating part and the driving part.

In order to attach the locking device to the valve, the conventional valve operating handle is removed from the valve nut (11) and the drive part (14) is attached by a secondary nut (15).

A rod (43) suitable for the valve is selected, cut to the appropriate length, and then attached to the rotating part (21) with four driving pins.

The rotating part and its flange are mounted on the driving part, and the uppermost end of the driving part engages with the bearing (41). A linear but flexible gauge (retainer) (38) for the ball is loaded into the grooves in line with the rotating and driving parts of (17) and (30), respectively. The holding part of the ball is inserted from a window provided in the rotating part.

A sufficiently long gauge is used. It is important that the holding part is a continuous, spaced array of ball balls all around the groove (17). By attaching the key device (32) to the cylinder wall (31) of the rotating part and then fixing the key device with the safety bolt (34), the attachment is completed.

  The locking portion is completed by inserting the ball into the groove (30) of the rotating portion. As a result, an annular ball raceway is formed between the driving portion and the rotating portion. Assembly is completed by attaching the handle to the position. A security bolt (24) is used for assembly, and one bolt is screwed into the key device.

Once installed, the locking device cannot be removed unless it is partially destroyed. For example, the bolt (34) must be cut from the side plate (33) to which the key device is attached or the transverse plate must be cut using a typical angled grinder.

  As another case, when the cover plate (40) is cut to the extent that the secondary bolt (15) is exposed and the entire locking device is removed, the cover plate (40) has a hole (53) in the center. However, this causes the valve stem of the valve to rise relatively long through this hole when the valve of the valve is opened.

  In this case, although not shown, a sleeve is attached under the cover plate to make it difficult to reach the secondary nut (15).

  If the valve stem rises less than the secondary nut (15), an inner cap is placed under the cover plate (40) and attached to the side of the bearing ring (41) as shown in FIG.

It is the schematic of a locking device. It is the schematic of a locking device. It is front sectional drawing of a locking device. It is the enlarged view which expanded and showed a part of structure shown by FIG. FIG. 5 is a plan sectional view of a position indicated by a symbol V-V in FIG. 3. FIG. 4 is a plan sectional view of a position indicated by a symbol VI-VI in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Locking device 11 Operation part, Nut 12 Main body, Upper part 13 Valve stem 14 Drive part 15 Secondary nut, Secondary bolt 16 Flange 17 Groove 18 Wall 19 Recess 21 Rotating part 22 Hand wheel 24 Bolt 26 Trunk part 27 Stem, Shaft Part 29 Flange 30 Groove 31 Side wall, Wall 32 Key device 33 Side plate 34 Safety bolt 35 Partially, Leg part 36 Channel, Groove 37 Ball 38 Gauge (Retainer)
40 Cover plate 41 Bearing, bearing, bearing ring 42 Bolt 43 袴 Cover, 袴 44 Pin 46 Receiving port 47 Plate key, key 49 Non-rotating 50 Cam 53 Hole

Claims (11)

A locking device (10) attached to a valve comprising a main body (12) and an operating part (11) protruding therefrom, wherein the locking device has a drive part (14), which is suitable for attachment of a rotating part. The rotating part (21) is mounted on a common shaft, and the key device (32) is mounted on the rotating part, and the key device selectively engages the driving part by using a key. A detent is provided to prevent the associated movement of the drive part and the rotary part,
The drive part is provided with an arcuate outwardly-grooved groove (17), the cross-section of which is a partial circle, and the rotating part groove is similarly an arcuately-inwardly grooved part of a circular cross-section. Is provided. The two grooves provided in the driving part and the rotating part coincide with each other on the axis, and the two grooves face each other,
Further, the two grooves (17, 30) of the rotating portion (21) and the driving portion (14) are configured such that a plurality of ball balls are partially positioned in the two grooves, respectively. It is also characterized in that the associated rotation between the parts is possible, but the associated on-axis movement is prevented,
Further, the key device (32) has two grooves of opposing grooves (17, 30) arranged in a line, and a part (35) of the key device is provided to hold the ball ball in the groove. It is characterized by
Locking device. 2. The locking device according to claim 1, wherein a groove (17) is provided in the drive part (14), the groove is continuous and the rotating part is surrounded on the outer periphery. A portion (35) of the key device (32) is sealed in the groove (17) of the rotating portion, holds the ball, and the arc-shaped groove (30) and the arc-shaped channel (36) in the rotating portion are aligned. 3. The locking device according to claim 2, wherein the ball is positioned in the channel groove as well as in the opposite groove of the drive portion. A bearing (41) is provided between the drive part (14) and the rotating part (21), the position is away from the opposite grooves and is on the shaft, and the bearing is a ring of low friction material. The locking device according to any one of claims 1 to 3, wherein the bearing is disposed between the driving portion and the rotating portion, but needs to be attached to one of them. The rotating part is generally in the form of a cylinder, and an opening is provided in the side wall of the cylinder. The key device (32) is located between the opening and the side plate (33) attached to the rotating part. The locking device according to any one of claims 1 to 4, wherein the locking device is installed. The locking device according to claim 5, wherein a safety bolt (34) is used when attaching the key device (32) to the side plate (33) of the rotating part. 7. The rotating part according to any one of claims 1 to 6, wherein the rotating part has a hook, but the shape is practical and can partially surround the upper structural part (12) of the valve. Locking device. By inserting or removing a key, the cam (50) can be engaged in the recess (19) of the drive part (14), so that the drive force from the rotating part (21) is applied to the drive part. 8. A locking device according to any one of claims 1 to 7, which can be applied. 9. The locking device according to claim 8, wherein a detent (49) engaging with the cam (50) is disposed therein to prevent rotation except when a correct key is sufficiently inserted into the key device. The drive part (14) has a cylindrical wall (18) with a plurality of indentations (19) in the wall, and the cam (50) fits in any of these indentations, whereby 10. The locking device according to claim 8, wherein a driving force from the rotating part can be transmitted to the rotating part. 11. The valve and the operation portion of the main body protruding from the main body are integrated, and the drive portion (14) of the locking device is directly attached to the operation portion (11). A locking device according to claim 1.

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