JPH0249873B2 - TSURISAGESHIKIBORUTOHITSUPARIKI - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field The present invention relates to a hanging bolt tensioning machine.

(B) Prior Art Hanging bolt tensioners are used to pull stud bolts and tighten nuts when connecting pressure vessels. The bolt tensioning machine is suspended via a trolley and a hoist, and can be moved horizontally and vertically. Such a bolt tensioning machine is positioned on a predetermined stud bolt and nut and then lowered, but the positioning must be performed accurately at this time. Conventional bolt tensioning machines are equipped with an optical position detector to detect the target stud bolt position and operate the trolley to reach that position. However, with such a positioning method, precise positioning cannot be performed. In other words, in order to raise and lower the bolt tensioner without colliding with stud bolts or nuts, positioning accuracy of approximately ±3 mm or less is required, but such high accuracy cannot be achieved simply by controlling the stop position of the trolley. I couldn't do it.
If the bolt tensioner comes into contact with the stud bolt when it is raised or lowered, there is a risk of damaging the expensive threaded part due to the precision of both.

(C) Object of the Invention The object of the present invention is to obtain a hanging bolt tensioning machine that can position a target stud bolt with a desired high precision.

(d) Structure of the Invention The present invention achieves the above object by providing a positioning guide device that mechanically and forcibly guides the bolt tensioner to a predetermined position. That is, the hanging bolt tensioning machine according to the present invention includes a guide member that can fit into a substantially V-shaped gap formed by the side surfaces of two adjacent round nuts; A pair of positioning guide devices are provided, each having an actuator that can be moved between a position fitted into the V-shaped gap and a position outside the gap.

(E) Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 5 of the accompanying drawings.

1 and 2, a pair of positioning guide devices 12 and 1 are shown suspended above the lid 10 of the pressure vessel.
2', the bolt tensioner 14 is shown. The bolt tensioner 14 is connected to a hoist 18 via a wire 16.
The hoist 18 is horizontally movable by a trolley 20.
Therefore, the bolt tensioner 14 is movable in three dimensions. Positioning guide devices 12 and 12' are provided at approximately symmetrical positions on the outer circumference of the bolt tensioner 14. Since the positioning guide device 12 and the positioning guide device 12' are the same, only the positioning guide device 12 will be described below. The positioning guide device 12 includes a slide holder 22 attached to the bolt tensioner 14, and a slide holder 22 attached to the bolt tensioner 14.
2, the rod 24 is guided so as to be movable in the vertical direction.
, a guide frame 26 fixed to the lower end of the rod 24, a pneumatic cylinder 28 which is an actuator attached to the guide frame 26, and a guide member 30 attached to the tip of the piston rod of the pneumatic cylinder 28 (see Figures 3 and 4). ) and a switching valve 32 that controls the operation of the pneumatic cylinder 28.
and an optical position detector (consisting of a light emitter 33a and a light receiver 33b).
The substantially wedge-shaped guide member 30 can fit into a substantially V-shaped gap 37 formed between round nuts 36 screwed into mutually adjacent stud bolts 34, as shown in FIG. As for shape and arrangement. Therefore, the guide member 30 is moved between the two nuts 36 by the actuation of the pneumatic cylinder 28.
It is possible to move between a position in which it fits into a substantially V-shaped gap 37 formed by and a position outside this gap 37. As shown in FIG. 3, the light emitting section 33a and the light receiving section 33b of the optical position detector are arranged on the outside and inside of the circumference around which the stud bolts 34 are arranged, respectively. Moreover, when the light emitting part 33a and the light receiving part 33b come to the position of the gap 37 where the guide member 30 is located, the light emitting part 33a
The arrangement is such that a light beam emitted from the light receiving section 33b passes through a gap 37 adjacent to the gap 37 described above. Note that the guide frame 26 is provided with wheels 38 so that the guide frame 26 can be easily moved on the lid 10 of the pressure vessel. As mentioned above, the positioning guide device 12 having the above-described configuration and the positioning guide device 12' having a similar configuration are installed at substantially symmetrical positions of the bolt tensioner 14, but the installation positions are different from the positioning guide device 12'. When the guide members 30 and 30' of the guide devices 12 and 12' respectively fit into the approximately V-shaped gap 37 between the nuts 36, the bolt tensioner 14
The center position of the stud bolt 34 and the nut 36 are set to coincide with each other.

Next, the operation of this embodiment will be explained. The positioning of the bolt tensioner 14 is performed as follows. First, the switching valve 32 is switched to the opposite state to the state shown in FIG.
Set it to be located outside of 7. Next, the hoist 18 is operated to move the wheels 3 of the guide frame 26.
8 is lowered to a position where it contacts the lid 10 of the pressure vessel (note that in this state, the bolt tensioner 14 is located above the upper end of the stud bolt 34). When the trolley 20 is run in this state,
Bolt tensioner 1 for targeting stud bolts 34 and nuts 36 by means of optical position detectors
4 positions can be detected. That is, each time the light emitted from the light emitter 33a passes through the gap between the adjacent nuts 36, the light receiving section 33
b outputs a signal, and by counting this output signal with a predetermined control device, it is possible to recognize whether the bolt tensioner 14 has reached the target position of the stud bolt 34 and nut 36. can. When the bolt tensioner 14 reaches the target position on the stud bolt 34 and nut 36, by stopping the operation of the trolley 20, the bolt tensioner 14 can be stopped approximately at the target position. However, in this state, the positioning is not accurate, so
If the bolt tensioner 14 is lowered in this state, there is a risk that the inside of the bolt tensioner 14 will come into contact with the threaded portion of the stud bolt 34. Therefore, by operating the positioning guide devices 12 and 12',
Accurate positioning is performed as follows. That is, first, the switching valve 32 is switched, and the pneumatic cylinder 2
8. Make the piston rod stick out. Guide member 3
If the guide member 30 is not located exactly in the middle of two adjacent nuts 36, the guide member 30 will contact one of the two nuts 36 first.
When the guide member 30 contacts one of the nuts 36, the thrust force F of the piston rod generates a force component F' in a direction perpendicular to the axial direction of the piston rod, as shown in FIG. 5, for example. This force component F' causes the guide frame 26 to move toward the guide member 30.
moves in the direction to be located at the middle part of the nut 36. By doing this, the guide element 30 (and the guide element 30' of the further positioning guide device 12') finally fits into the gap 37 between the nuts 36. This forced movement of the frame 26 also moves the bolt tensioner 14, so that the bolt tensioner 14 comes directly above the targeted stud bolt 34 and nut 36. At this time, the error with respect to the target position can be set to ±3 mm or less. Therefore,
When the hoist 18 is operated from this state to lower the bolt tensioner 14, the bolt tensioner 14 can reach the lid 10 of the pressure vessel without contacting the stud bolt 34 and nut 36. Next, the stud bolt 34 is pulled by the bolt tensioner 14 and the nut 36 is tightened.
Next, the bolt tensioner 14 is pulled up by the hoist 18, and the next stud bolt 34 is worked on. By carrying out the operations sequentially in this manner, the lid of the pressure vessel can be connected with easy operation without causing an accident such as damage to the threaded portion of the stud bolt 34. Note that the guide member 30 may have a shape other than that shown in the drawings as long as it can generate a force component F' when it comes into contact with the nut 36.
Further, although a pneumatic cylinder is used as the actuator for moving the guide member 30, any other electric or hydraulic actuator may be used as long as it can move the guide member 30.

(F) Effects of the Invention As explained above, according to the present invention, in a hanging bolt tensioning machine used for tightening or loosening a cylindrical round nut and a stud bolt, two adjacent round nuts can be tightened or loosened. A guide member that can fit into the approximately V-shaped gap formed by the side surface of the nut, and the guide member is moved between a position where it fits into the approximately V-shaped gap and a position outside the gap. an actuator (in the described embodiment, pneumatic cylinder 28) capable of
Since a pair of positioning guide devices (12, 12') having the following are provided at substantially symmetrical positions of the bolt tensioning machine, the bolt tensioning machine can be accurately aligned to the targeted stud bolt and nut positions. This simplifies the work and prevents damage to the bolt tensioner and the threaded portion of the stud bolt.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a hanging bolt tensioning machine which is an embodiment of the present invention, Fig. 2 is a side view of Fig. 1,
FIG. 3 is a plan view of the positioning guide device, FIG. 4 is a side view of the positioning guide device, and FIG. 5 is a diagram schematically showing the force acting on the guide member. 10... Lid, 12, 12'... Positioning guide device, 14... Bolt tensioner, 18... Hoist, 20... Trolley, 22... Slide holder, 24... Rod, 26... Guide frame, 2
8...Pneumatic cylinder (actuator), 30
... Guide member, 32 ... Switching valve, 33a ... Light emitter, 33b ... Light receiver, 34 ... Stud bolt, 36 ... Nut, 37 ... V-shaped gap, 38 ... Wheel.

Claims (1)

[Claims] 1. In a hanging bolt tensioning machine used for tightening or loosening a cylindrical round nut and a stud bolt, a substantially V formed by the side surfaces of two adjacent round nuts is provided. A positioning device that includes a guide member that can fit into a substantially V-shaped gap and an actuator that can move the guide member between a position where the guide member fits into the substantially V-shaped gap and a position outside the gap. A hanging bolt tensioning machine characterized in that a pair of guide devices are provided at substantially symmetrical positions on the bolt tensioning machine.