JPH0796175B2 - Control method of automatic flange bolt tightening / loosening device - Google Patents

Description

The present invention relates to a method for controlling an automatic tightening / loosening device for bolts / nuts for fastening circular flanges.

<Prior art> There are many tools for tightening and tightening bolts and nuts individually, but no device has been developed for automatically and continuously tightening bolts and nuts on a circular flange with a simple structure. .

<Problems to be Solved by the Invention> For example, when tightening and tightening flange bolts that fasten circular flanges of heat exchangers of nuclear power plants, etc., they are handled by remote control in order to avoid exposure to workers and to ensure work reliability. A possible tightening device is desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for controlling a flange bolt automatic tightening / loosening device that can automatically and easily tighten and loosen a flange bolt of a circular flange. There is.

<Means for Solving the Problems> A method of controlling a flange bolt automatic tightening / loosening device according to the present invention that achieves this object is provided with a pair of coaxial head members that can be engaged with a bolt head or a nut. First and second clamp mechanisms each having a holder and a clamp cylinder for moving the holder toward and away from each other are provided,
A driving reciprocating cylinder is interposed between the clamp mechanisms by connecting them so that they can approach and separate from each other, and at least the pair of holders of the one clamp mechanism respectively rotate and drive the holders. In a flange bolt automatic tightening / releasing device, which is provided with respective pressure receivers for receiving a force, the holders of the first clamp mechanism are brought closer to each other by their clamp cylinders and clamp a bolt / nut between them. On the other hand, the holders of the second clamp mechanism are separated from each other by their clamp cylinders to unclamp the bolts and nuts, and in that state, the reciprocating cylinders are extended to adjoin the holders of the second clamp mechanism. After moving to the position of the bolt and nut, Clamping, then unclamping the bolt / nut by the holder of the first clamp mechanism, shortening the reciprocating cylinder to bring the holder of the first clamp mechanism to the position of the adjacent bolt / nut. After the movement, by repeatedly clamping the bolts and nuts with the holder, the flange bolt automatic tightening / releasing device is sequentially moved on the bolts and nuts of the flange, and the bolts and nuts are moved by the ratchet wrench in each bolt and nut. Characterized by tightening and tightening the nut.

<Operation> Clamping / unclamping of the bolts / nuts by the first and second clamping mechanisms and expansion / contraction of the reciprocating cylinder cause the flange bolt automatic tightening / releasing device to move sequentially on the circular flange, whereupon the ratchet wrench operates to manually The bolts and nuts are tightened and loosened over the entire circumference of the circular flange.

<Example> Hereinafter, one example of the present invention will be specifically described with reference to the drawings.

First, a flange bolt automatic tightening / loosening device according to an embodiment of the present invention will be described. FIG. 1 is a schematic plan view of a flange bolt automatic tightening / loosening device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view of a reciprocating cylinder thereof. . In FIGS. 1 and 2, 11 and 12 are circular flanges that are fastened to each other, 13 is a fastening bolt for the fastening, and 14 is a nut that is screwed to the bolt 13.
The nuts 13 and 14 are arranged at equal intervals on the circumference of the circular flanges 11 and 12.

The automatic tightening and loosening device is connected to the first and second members so that they can move toward and away from each other.
And second clamp mechanisms 15 and 16, and each clamp mechanism 15 and 16 is coaxially opposed to the pair of holders 1.
It is composed of a clamp cylinder 19 for moving the holders 7, 18 toward and away from each other and the holders 17, 18. As shown in FIG.
In each holder 17, 18, six guide pins 20 corresponding to the hexagonal shape of the nut 14 are supported at equal intervals in the circumferential direction so as to be movable in the axial direction, and are attached to the ends by springs 21 attached to their base ends. It is energized. The tips of these guide pins 20 are tapered and thin, and the diameter of the circle connecting the tips is slightly larger than the diagonal distance of the nut 14. Each of the holders 17 and 18 is rotatably supported by a support plate 22, and each support plate 22
Is fixed to a piston rod 23 of a clamp cylinder 19 parallel to the bolt 13.

Therefore, when the piston rod 23 of the clamp cylinder 19 is retracted, both holders 17 and 18 come close to each other and the nut 14 is inserted into the guide pin 20 to be in a clamped state. here,
As described above, the diameter of the circle connecting the tips of the guide pins 20 is larger than the diagonal distance of the nut 14, so that the tip of the guide pin 20 contacts the end surface of the nut 14 regardless of the rotation position of the nut 14. The guide pin 20
With the forward movement, the holders 17 and 18 are appropriately rotated according to the rotational position of the nut 14 due to the action of the tip tapered portion, so that the nut 14 is inserted between the guide pins 20. On the other hand, when the piston rod 23 of the clamp cylinder 19 is extended, both holders 17, 1
8 are separated from each other, and the guide pin 20 is unclamped from the nut 14.

As shown in FIGS. 1 and 2, the first clamp mechanism 15 has an arc-shaped guide hole 2 concentric with the flanges 11 and 12.
While a guide arm 25 having 4 is projectingly provided, a rod arm 27 for supporting a guide rod 26 slidably fitted in a guide hole 24 of the second clamp mechanism 16 is projectingly provided. Clamping mechanism 15, 16 has these arms 25,
They are connected by 27 so that they can approach and separate from each other. A driving reciprocating cylinder 28 is interposed between the clamp mechanisms 15 and 16.

As shown in FIG. 3, the reciprocating cylinder 28 has a cylinder 29 and a piston rod 30 inserted in the cylinder 29, and connecting pieces 31, 32 are provided at the ends of the cylinder 29 and the piston rod 30, respectively. It is projected. These connecting pieces 31 and 32 are respectively connected via the pins 33 to the first and second clamp mechanisms 15 and 1, respectively.
Connected to 6.

Here, the stroke of the reciprocating cylinder 28 is the circular flange 1
This corresponds to the distance between the adjacent bolts and nuts 13 and 14 of the bolts 1 and 12, and the expansion or contraction of the piston rod 30 causes the first or second clamp mechanism 15 or 16 to move to the adjacent bolts or nuts 1.
It is possible to move to 3,14.

Further, a ratchet wrench 34 for rotationally driving the holder 17 of the first clamp mechanism 15 is engaged with the holder 17 of the first clamp mechanism 15, and a pressure receiver 35 for receiving the rotational reaction force of the holder 18 is provided.
Are engaged, and the holders 17 and 18 are clamped to the nut 14 by the ratchet wrench 34.
The nut 14 is tightened and loosened by rotating.

Next, the transfer operation of such an automatic fastening / loosening device will be described. FIG. 4 to FIG. 10 are step explanatory diagrams of this relocation operation. First, as shown in step 1 of FIG. 4, from a state where both clamp mechanisms 15 and 16 are clamped, as shown in step 2 of FIG. The second clamp mechanism 16 in the forward direction is unclamped. Next, as shown in step 3 of FIG. 6, the reciprocating cylinder 28 is extended so that the second clamp mechanism 16
To the position of the adjacent bolt / nut D, and then, as shown in step 4 of FIG.
Clamp the bolt and nut D next to it. Next, the first clamp mechanism 15 is unclamped as shown in step 5 of FIG. 8, and subsequently the reciprocating cylinder 28 is shortened as shown in step 6 of FIG.
Is moved to the position of the adjacent bolt / nut C so as to follow the second clamp mechanism 16, and finally step 7 in FIG.
The bolt / nut C is clamped by the first clamp mechanism 15 as shown in FIG.

Then, in these 7 steps, the clamp mechanisms 15 and 16 move to the adjacent bolt positions, respectively, and by repeating this, the automatic tightening / releasing device can move along the entire circumference of the circular flanges 11 and 12. At the same time, the bolts and nuts 13 and 14 are tightened and loosened by the operation of the ratchet wrench 34 at each bolt position.

Next, an actual example of control for this transfer operation will be described.

FIG. 11 is a piping system diagram of the automatic tightening device. As shown in FIG. 11, the clamp cylinder 19 of the first and second clamp mechanisms 15 and 16 and the drive reciprocating cylinder 28 are reciprocated by five-way solenoid valves SV-2, SV-1, and SV-3, respectively. Controlled. The working fluid supply source is provided with a source pressure sensor S-1, and each cylinder 19, 28 is provided with sensors S-2 to S-7 for detecting the stroke end thereof. That is, the original pressure sensor S-1 detects whether the working fluid pressure is at a predetermined value,
The sensors S-2 and S-4 detect that the clamp cylinder 19 of the second clamp mechanism 16 is in an expanded unclamped state and a shortened clamped state, respectively, and the sensor S
-5 and S-7 detect that the clamp cylinder 19 of the first clamp mechanism 15 is in the extended unclamped state and the shortened clamped state, respectively, and the sensor S
-3 and S-6 detect the state in which the reciprocating cylinder 28 is extended and the clamp mechanisms 15 and 16 are separated, and the state in which the clamp mechanisms 15 and 16 are shortened and the clamp mechanisms 15 and 16 are close to each other. The signals of these sensors S-1 to S-7 are input to the control circuit 36 as shown in FIG. 12 which is a control block diagram, and the control circuit 36 controls the solenoid valves SV-1 to SV-3. Operate.

FIG. 13 shows a time chart of the operation of each solenoid valve SV-1 to SV-3 by the control circuit 36. As shown in Fig. 13, first, the solenoid valve SV-1 is turned on at the same time as the start, and the solenoid valve SV-1
-2, SV-3 are turned off, and the second clamp mechanism 16 is in an unclamped state. When the unclamping of the second clamp mechanism 16 is completed and the state of step 2 is reached, the sensor S
-2 detects it, and the signal turns on solenoid valve SV-3
Then, the reciprocating cylinder 28 extends to advance the second clamp mechanism 16. When the forward movement is completed and the state of step 3 is reached, the sensor S-3 detects it, and the solenoid valve SV-1 is turned off by the signal, and the second clamp mechanism 16 is brought into a clamped state. When the clamp is completed and the state of step 4 is reached, the sensor S-4 detects it, and the signal causes the solenoid valve SV-2 to be turned ON, and the first clamp mechanism 15 to be in the unclamped state. When this unclamping is completed and the state of step 5 is reached, the sensor S-5 detects it, and the signal causes the solenoid valve SV-3 to turn off, shortening the reciprocating cylinder 28 and causing the first clamp mechanism 15 to move. To move forward. When this advance is completed and the state of step 6 is reached,
The sensor S-6 detects it, and the signal from it detects the solenoid valve SV.
-2 is turned off and the first clamp mechanism 15 is clamped, and in step 7 when it is completed, the sensor S-7
Detecting this, one sequence of the relocation operation is completed, and the bolt tightening by the ratchet wrench 34 is performed there.

FIG. 14 shows an example of a control circuit based on the above time chart.

<Effects of the Invention> As described above in detail with reference to the embodiment, according to the present invention, it is possible to automatically and easily tighten and loosen the flange bolt of the circular flange with a simple device.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a flange bolt automatic tightening / loosening device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view of a reciprocating cylinder thereof. Fig. 4
Figure 10 is a step explanatory diagram of the transfer operation of this automatic tightening and loosening device
FIG. 11 is a piping system diagram of the automatic fastening device, FIG. 12 is a control block diagram thereof, FIG. 13 is a time chart of its solenoid valve operation, and FIG. 14 is its control circuit diagram. In the figure, 11,12 are circular flanges, 13 are bolts, 14 are nuts, 15 is the first clamp mechanism, 16 is the second clamp mechanism, 17,18 is a holder, 19 is a clamp cylinder, and 28 is for driving. A reciprocating cylinder, a ratchet wrench 34, and a pressure receiver 35.

Claims (1)

[Claims] 1. A first and a second clamp mechanism, each of which has a pair of holders that are coaxially opposed to each other and can engage with a bolt head or a nut, and a clamp cylinder that moves the holders toward and away from each other. And a ratchet wrench for rotating and driving the holders in at least the pair of holders of at least one of the clamp mechanisms, while providing a driving reciprocating cylinder between the clamp mechanisms by connecting them so that they can approach and separate from each other. In a flange bolt automatic tightening / releasing device, which is provided with pressure receivers for receiving a rotational reaction force, the holders of the first clamp mechanism are brought closer to each other by their clamp cylinders, and a bolt / nut is clamped between them for clamping. On the other hand, the holders of the second clamp mechanism are connected to each other by the clamp cylinders. Hansa was a bolt and nut clamping released, bolt which by extending said reciprocating cylinder in that state adjacent the holder of the second clamping mechanism
After moving to the position of the nut, the bolt / nut is clamped by the holder, then the bolt / nut is unclamped by the holder of the first clamp mechanism, and the reciprocating cylinder is shortened to reduce the reciprocating cylinder. By moving the holder of the first clamping mechanism to the positions of the adjacent bolts and nuts and then clamping the bolts and nuts with the holder repeatedly, the flange bolt automatic tightening device is mounted on the bolts and nuts of the flange. Is sequentially moved, and the bolts and nuts are tightened and loosened by the ratchet wrench in each of the bolts and nuts.