JPH0247829Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an improvement of an air cylinder with a manual handle that is installed in a valve device used for piping of various plants such as nuclear power generation and operates the valve. .

[Prior Art] As an example of an air cylinder with a manual handle installed in a valve device, the one shown in FIG. 3 is known. In the figure, 1 is a cylinder, 2 is a bottom plate integrally fixed to the cylinder 1, and 3 is a cylinder.
Reference numeral 4 indicates a piston disposed inside to seal the inner chamber A of the cylinder 1, 4 indicates an air supply hole bored in the bottom plate 2 and communicates with the inner chamber A, and 5 indicates the piston 3.
The valve rod is connected to the valve rod and has one end connected to the valve (not shown) side. Reference numeral 6 denotes a bonnet which is integrally fixed to the cylinder 1 and includes a coil spring 7 that presses the piston 3 in a direction to reduce the volume of the inner chamber A. The bonnet 6 is connected to the cylinder 1 and the bottom plate. 2 constitutes the body 8. Furthermore, 9 is a manual handle,
10 is a screw mechanism 10a by rotation of the handle 9.
acts to reciprocate in the axial direction, and the tip portion 10b
A stem 13 is connected to a piston rod 11 extending from the piston 3 with a play 12;
A yoke 14 supporting the stem 10 is a guide plate fixed to a predetermined position of the stem 10 with bolts 15 and having both ends engaged with the yoke 13.

The air cylinder with a manual handle constructed as described above supplies air from the air supply hole 4 to the cylinder inner chamber A to pressurize the air pressure inside the inner chamber A, thereby counteracting the pressing force of the coil spring 7. The direction in which the coil spring 7 is compressed (upper part of the figure)
The piston 3 operates, and accordingly the valve rod 5 opens a valve (not shown).
When the inner chamber A is depressurized, the coil spring 7
The valve closes due to the weight of the piston 3 and other members. Further, the stroke distance of the piston 3 is limited to within the axial length of the play space 12 at the connecting portion between the stem 10 and the piston rod 11, and the upper limit of the stroke is such that the inner wall surface 11' of the connecting portion of the piston rod 11 is This is the position at the time when it abuts the tip end 10b of 10. That is, the position of the stem 10 in the axial direction has a very important meaning for the operation of the piston 3 and, ultimately, for the operation of the valve.
0 must always be fixed in the proper position, for example, in an emergency such as when the valve operation stops due to the inability to supply air to the cylinder interior A, or when testing the operation or inspecting the equipment. Except for this, the axial position of the stem 10 is not normally moved by operating the manual handle 9.

[Problem that the invention attempts to solve]

However, the above-mentioned conventional air cylinder with a manual handle is not provided with any means for preventing movement of the stem 3, and therefore, even if the worker does not have the intention to operate the handle 9, the operator can use his or her body while passing by. Alternatively, the handle 9 may rotate due to accidental contact with a part of clothing, etc., and the stem 3 may be rotated.
If it moves from its proper position,
This poses a problem in that the function of the valve device is no longer fully performed and there is a risk of leakage of contaminated fluid.

[Means for solving problems]

In order to solve the above problem, the air cylinder with a manual handle according to the present invention is equipped with a lock mechanism to prevent malfunction of the stem, and when the manual handle is rotated, the stem follows the handle. For the purpose of preventing rotation, a pin is attached to the end of the guide plate, which is fixed at a predetermined position in the axial direction of the stem and whose end engages a yoke that supports the stem and the handle. A hole is bored and an engagement recess is formed at a predetermined position in the axial direction of the yoke, and a pin to be inserted into the pin hole is engaged with the engagement recess to fix the stem at a predetermined position in the axial direction. It is configured.

[Effect]

The guide plate was originally capable of moving in the axial direction together with the stem, and only restricted the stem from rotating together with the handle through engagement with the yoke, but as described above, the guide plate By having means for axially engaging the stem and the yoke, it is possible to prevent the stem, which is integrally fixed to the guide plate, from moving in the axial direction, thereby preventing an operator from accidentally touching the manual handle. Even if they come into contact, the stem is fixed at a predetermined proper position in the axial direction by the engagement of the engagement means (the pin hole of the guide plate, the pin inserted into the pin hole, and the engagement recess of the yoke). It does not move, and the manual handle itself, which is in a threaded relationship with the stem, does not easily rotate.

〔Example〕

Next, a preferred embodiment of the air cylinder with a manual handle according to the present invention will be described based on the drawings. FIG. 1 is a front view of the entire device, showing a state in which the stem 10 is immovably fixed at a predetermined position in the axial direction to maintain a proper stroke of the piston 3, and FIG. 2 is a front view of the entire device. in-
FIG. In this embodiment, the stem 10 is firmly fixed at a predetermined position in the axial direction by fastening bolts 15, 15, and both ends 14'a, 1
4'a, 14'b, 14'b are the stem 10 and the manual handle 9 which is in a threaded relationship with the stem 10;
Yoke 1 installed on body 8 for the purpose of supporting
3 and 13', and is provided to prevent the stem 10 from rotating following the handle 9. Part 14'b, 1
Pin holes 14'c, 14'c are bored in the vicinity of 4'b, and an annular engagement groove 13'a that engages with the engagement pin 16 inserted into the pin holes 14'c, 14'c is formed in the yoke. 13' is carved at a predetermined position in the axial direction of the stem 10, and the engagement between the engagement groove 13'a and the engagement pin 16 allows the stem 10 to be placed in an appropriate position in the axial direction during normal operation. In addition to fixing the
The rotation of the handle 9 that is threaded with the stem 10 is prevented, and the proper stroke of the piston 3 is maintained. In addition, in an emergency, the stem 10 and handle 9 can be released from the fixed state by inserting the engagement pin 16 into the pin holes 14'c and 14'c.
You just need to extract more. Note that reference numerals 17 and 17 are split pins for preventing the engagement pin 16 from coming off.

[Effect of idea]

As described above, the air cylinder with a manual handle of the present invention conventionally has an axial locking mechanism added to the guide plate fixed to the stem for the purpose of preventing the stem from rotating. Should any part of the person's body or clothing accidentally come into contact with the manual handle, this will prevent the handle from rotating and the stem from moving from its proper position, thus preventing the piston from moving. The practical effect of the present invention is extremely large, since it is possible to maintain a proper stroke, maintain the function of the valve device, and prevent leakage of contaminated fluid.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of an air cylinder with a manual handle according to the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, and Fig. 3 is a front view showing an example of a conventional air cylinder with a manual handle. It is. 3... Piston, 8... Body, 9... Handle, 10... Stem, 13, 13'... Yoke,
13'a...Engagement groove, 14'...Guide plate,
14'c...pin hole, 16...engaging pin.

Claims (1)

[Scope of utility model registration request] A piston in the cylinder is actuated by supplying air to the inner chamber of the cylinder, and a valve stem interlocked with the pin strike operates the valve, and during testing/inspection or in an emergency, the piston and the piston are operated by a manual handle during testing, inspection, or in an emergency. In an air cylinder with a manual handle that operates a valve, a stem is connected with one end to the piston side with play and reciprocates in an axial direction as the manual handle rotates, following the rotation of the manual handle. To prevent rotation in the circumferential direction,
A pin hole is formed in the end of the guide plate, which is fixed at a predetermined position in the axial direction of the stem, and whose end engages with a yoke serving as a support member of the stem and the manual handle. An engagement groove is formed at a predetermined position in the axial direction of the handle, and the stem is fixed at the predetermined position in the axial direction by engaging a pin inserted into the pin hole with the engagement groove. Air cylinder with.