JPH032001Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a spring return type cylinder actuator, and is particularly applicable to valve operations such as ball valves and butterfly valves that open and close by partially rotating. This invention relates to improvements in actuators used.

More specifically, the cylinder type actuator to which the present invention is applied has a cylinder and a spring device arranged in series, and is actuated in one direction by fluid pressure such as air or oil fed into the cylinder, and in the other direction. This is a spring return type cylinder actuator that is operated by the elastic repulsive force of the spring of the spring device.

(Prior Art) FIG. 5 is a cross-sectional view showing an example of a conventional spring return type cylinder actuator, and FIG. 6 is a partially cutaway front view of FIG. 5.

In the drawing, the spring 2 housed in the spring device 1 is in a compressed state in which it still exerts a strong elastic repulsion force even after it has been fully expanded within the spring device 1 as shown in FIG.

Therefore, when the tightening nut 6 of the rod 5 that fastens the ends 3 and 4 of the spring device 1 is loosened and removed, the end 3 may be blown off by the elastic repulsive force of the spring 2, or the spring There is a risk of injury to workers or damage to equipment as the particles may fly out.

To prevent this risk, when disassembling conventional spring return type cylinder actuators, replace at least two of the rods 5 with long screw rods for disassembly and assembly, then loosen the nuts and disassemble. are doing. Figure 7 shows the rod 5 in Figure 6.
This is a partial front view where one of the screws has been replaced with a long screw rod 7 for disassembly and assembly.In the same figure, only one screw has been replaced, but at least two must be replaced in addition to the other one located diagonally. . After that, nut 6 was loosened and disassembled.

When assembling, at least two long screw rods 7 for disassembly and assembly are installed, the nuts 6 are screwed in, and the springs 2 are sequentially compressed and assembled, and then the long screw rods 7 are replaced with the regular rods 5. I am assembling it. The reason for doing this is that if a long screw is used as it is, it will require a large space and be dangerous to handle, and there is a risk that the threaded portion of the rod 7 will be damaged, making disassembly and assembly difficult.

(Problems to be solved by the invention) As mentioned above, in conventional spring return type cylinder actuators, the above-mentioned dangers are prevented by using long threaded rods for disassembly and assembly. However, the structure is not such that it cannot be disassembled without using this long threaded rod, so some people do not know that it is dangerous to use the long threaded rod for disassembly and assembly, or they forget to do so. There is a risk of loosening.

There is also the risk that the nut will loosen due to long-term vibration and eventually come off. It is extremely difficult to make sure that everyone knows about this, never forgets to use it, and that the rod for disassembling and reassembling is kept nearby.

That is, the above-mentioned conventional means are insufficient as a risk prevention measure.

This invention was developed in order to solve the problems of the conventional technology, and its purpose is, as mentioned above, to ensure that even if the user does not know about it, forgets it carelessly, or loosens it due to vibration, etc. The object of the present invention is to provide an inherently safe spring return type cylindrical actuator that does not pose a danger to customers and does not require special disassembly parts.
Still another object is to make it easy to handle by adopting a simple structure.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides that one end of a spring provided in a spring device is brought into contact with one end of the spring device, and the other end is brought into contact with one end of the spring device. In a cylinder type actuator that abuts against a portion that presses a piston and has one end and the other end of the spring device fastened together with a rod, the rod is formed to have a long threaded length. A screw and a female thread are screwed together, and the base of the female thread is screwed into the other end of the spring device, and the base of the male thread is rotatably provided at one end of the spring device. In addition, a spring return type cylinder actuator is used, which is provided with a locking member such as a wing-like piece that locks into a spring box near the tip of the female thread.

(Function) Accordingly, in the present invention, the rod that fastens both ends of the spring device is formed so that the male thread and the female thread have a long threaded length, and are screwed together. The female thread is screwed into the other end of the spring box on the actuator body side, and there is a locking member such as a wing-like piece near the tip that locks onto the spring box, so turn the male thread. When loosened, the locking member of the female screw is locked in the spring box and cannot rotate, and the male screw comes out. The elastic repulsive force of the spring gradually weakens accordingly. Because the male and female threads are formed to have a long threaded length and are screwed together, by the time they are unscrewed, the elastic repulsive force of the spring has weakened sufficiently, and the end may fly off or the spring may There is no risk of it flying out and causing injury to workers or damage to equipment.

(Example) Hereinafter, the present invention will be described in detail based on an illustrative example. FIG. 1 is a cross-sectional view showing an example of the present invention. However, one end 1 of the spring device 11
Although the position of the rod 15 that fastens the rod 3 and the other end 14 is not necessarily on the cross section, it is shown on the cross section for convenience. 2 is a partial front view showing the spring device portion of FIG. 1. FIG.

The rod 15 is constructed by screwing together a female thread 18 and a male thread 20, and the female thread 18 is threaded onto the other end 14 of the spring device on the actuator main body side, and has a wing-like shape at a position near the tip. Pieces 16 are fixed by welding.

The winglet 16 is locked to a spring box 30;
When the spring box 30 is in the assembled position shown, the internal thread 18 cannot be rotated into or out of the end 14. Figure 3a shows the first
The figure shows the shape of the wing-like piece 16 in the cross section taken along the line A-A', and the figures b and c show other examples of the wing-like piece, in which the wing-like piece 16 is engaged by the spring box 30. This shows a state in which the female screw 18 is stopped and cannot rotate at its normal position. In FIG. 1, the female thread 18 has a female thread 17 at its tip, which is connected to a threaded portion 19 of the male thread 20 of the hexagonal bolt.
is screwed in, and this threaded portion 19 is made sufficiently long so that the screwing length is long.

The spring 12 has one end in contact with one end 13 of the spring device 11, and the other end in contact with a portion that presses the piston 21, that is, a receiver 23 attached to the piston rod 22. Even in the state shown in FIG. 1, that is, the state in which the spring 12 is at its maximum extension and the piston 21 is moved the most to the right in the figure, the spring 12 is still in a compressed state in which a strong elastic repulsive force remains.

Now, to disassemble the spring device 11, use the rod 15.
When the male screw 20 of
6 is locked in the spring box 30 and cannot be rotated, and the male screw 2
0 comes out to the left of Figure 1. At the same time, the one end 13 is moved to the left in the figure by the remaining elastic repulsive force of the spring 12. As the one end 13 moves, the length of the spring 12 gradually increases, and the elastic repulsive force of the spring 12 gradually weakens accordingly. and a male screw 2 with a long screw-in length.
0 and the female screw 18 are unscrewed, the spring 12
The elastic repulsive force of is weakened sufficiently, and one end 1
3 or the spring 12 will not fly out, causing injury to workers or damage to equipment.

In the present invention, as described above, the wing-shaped piece 16 is attached to the female thread.
is fixed and locked to the spring box 30 to make it unrotatable, and the male screw 20 is rotated to screw in or out. In FIG. 1, if there is no wing-like piece 16, when the male thread 20 is loosened and the female thread 18 rotates accordingly, the other end 1
The threaded part of the female screw 18 that is screwed into 4 comes out, and the elastic repulsive force of the spring 12 causes the one end 1
3 will be sent flying along with Rod 15. Therefore, the female thread 18 must not rotate when the male thread 20 is screwed out. The usual method for this is to weld the female thread 18 to the other end 14.
It is fixed by a method such as pin driving. In the case of such a structure, assembly work must be performed after the other end 14 and several female screws 18 are fixed together, and this integrated part has a complicated shape. It is difficult to assemble. In this example structure, after the other end 14 is assembled to the actuator body, the spring receiver 23 is attached to the piston rod 22, and then the internal screw 18 with the wing-shaped piece 16 is screwed into the other end 14, and then the spring It is assembled in the order of inserting the box 30 and the spring 12, and attaching the one end 13 by screwing the male thread 20 into the female thread 18, which has the advantage that the parts are simple in shape and easy to handle. Note that the fixing position of the wing-like piece 16 to the female thread 18 is between the male thread 20 and the female thread 1.
Even if the spring box 30 moves to the left until it is unthreaded from the wing 16, the spring box 30 of the winglet 16
It must be provided at a position near the right tip of the female thread 18 to ensure a locked state.

In FIG. 1, 24 is a cylinder that moves the piston 21 by fluid pressure such as air or oil, and 25 is a fluid inlet/outlet for applying fluid pressure such as air or oil to the piston 21 of the cylinder 24. 26 is a Scotch yoke for converting the reciprocating motion of the piston rod 22 into a partial rotational motion of the output shaft 27, and 28 and 29 are stoppers for determining the position of the reciprocating motion of the piston rod 22 in the right and left directions, respectively.

FIG. 4 is a cross-sectional view showing another embodiment of the present invention. However, the position of the rod 35 that fastens the one end 33 and the other end 34 of the spring device 31 is not necessarily on the cross section, but is shown on the cross section for convenience. In the embodiment shown in FIG. 4, the left side of the spring device 31 is a cylinder 44, and the piston 41 is moved to the right in the figure by the pressure of fluid such as air or oil introduced from the fluid inlet/outlet 45. can. One end of the spring 32 is in contact with one side end 33 of the spring device, and the other end is in contact with a portion that presses the piston 41, that is, the back surface of the piston 41. The other structures are substantially the same as those described in the above embodiments. The code of the corresponding part is
It is indicated by a numerical code obtained by adding 20 to the numerical value shown in Figure 1. The operation and effect of the embodiment shown in FIG. 4 are also exactly the same as those of the embodiment shown in FIG.

(Effects of the invention) As is clear from the above, the present invention has the following useful effects.

When disassembling the spring device, there is no risk of the end flying off or the spring flying out, causing injury to workers or damage to equipment.

Hazards can be prevented without using special disassembly and assembly parts, and the work is easy.

Even if you don't know how to disassemble it, forget to do it, or it loosens due to vibration, it will never be in a dangerous situation.

The advantages include that the parts have simple shapes and are easy to handle.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 a are FIG. 1 is a partial front view and a partial sectional view, FIGS. 3 b, c and 4 are a partial sectional view and a cross sectional view showing other embodiments of the present invention, and FIG. 5 is a spring 6 is a partially cutaway front view of FIG. 5, and FIG. 7 is a cross-sectional view showing a conventional example of a return type cylinder actuator. FIG. 7 is a cross-sectional view of a conventional example of a return type cylinder actuator. FIG. 3 is a partial front view for explaining the disassembly procedure. 11, 31... Spring device, 12, 32... Spring, 13, 33... One side end, 14, 34... Other side end, 15, 35... Rod, 16, 36...
Pterygium, 18, 38... Female thread, 20, 40...
Male thread, 21, 41... Piston, 30, 50...
...Spring box.

Claims (1)

[Claims for Utility Model Registration] (1) One end of a spring provided in a spring device is brought into contact with one side end of the spring device, the other end is brought into contact with a portion that presses a piston, and the spring is In a cylinder type actuator in which one end of the device and the other end of the device are fastened with a rod, the above-mentioned rod is formed by screwing together a male thread and a female thread formed to have a long threaded length,
The base of this female thread is screwed into the other end of the spring device described above, and the base of the male thread is rotatably provided at one end of the spring device, and further, at a position near the tip of the female thread, A spring return type cylinder actuator characterized by being provided with a locking member that locks into a spring box. (2) A spring return type cylinder actuator according to claim 1, in which the above-mentioned locking member is a wing-like piece.