JPH0748087A - Hollow cylindrical type element holding device - Google Patents

Abstract

PURPOSE:To provide a hollow cylinder type element holding device which can cope with the installation and repair of a pipe shaped element such as ceramics pipe in a large-sized plant, has a large holding force, and possesses the sure remote operation performance and high reliability. CONSTITUTION:A hollow cylinder type element holding device is equipped with an air motor 1 which is revolved in the normal and reverse directions by a pneumatic source 21, and a plurality of holding plates 15 which revolve a shaft 23 through the normal and reverse revolution of the air motor 1 and spreads and contracts the diameter through the contact and separation with the inner surface of a hollow cylinder type element 16 through a link 13 mechanism by the shift in the axial direction for the air motor 1 of a link operating nut 24 screwed with the shaft 23. On the air motor 1, an air relief valve 8 for preventing the excessive spreading of the holding plate 15 is installed on the air motor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow cylindrical element holding device applicable to the installation and repair of ceramic tubes used in heat exchangers for high temperature gas or dust removers.

[0002]

2. Description of the Related Art "Heat exchanger for high-temperature gas, or a device which is conventionally used as a device for gripping the inner surface of the end of a pipe-shaped element used in a plant such as a dust remover is commercially available. There is an air picker "(made by Bridgestone) or an airbag type. Each of these is of a type having a rubber bag and pressing the inner surface of the element tube by air pressure and gripping by the frictional force generated thereby.

[0003]

Although the conventional air bag type gripping device is reasonably good in operability, it is necessary to control the air pressure, and the air pressure is insufficiently controlled. I was worried about reliability. In a large-scale plant, the length of the unit element is 3 to 4 m, and the gripping force of the pipe-shaped element not only requires 100 kg to 150 kg of its own weight and pulling resistance, but also
There are many elements. Therefore, regarding the gripping device for a pipe-shaped element in a large-scale plant, reliable remote operability and high reliability have been demanded from the viewpoint of rationalizing repair work such as drawing and mounting and ensuring safety. The present invention responds to these needs, and can also support installation and repair of pipe-shaped elements such as ceramic pipes in large-scale plants, the gripping force of the pipe-shaped element is large, and with reliable remote operability, An object of the present invention is to provide a highly reliable hollow cylindrical element gripping device.

[0004]

Therefore, the present invention is directed to an air motor that rotates forward and backward by an air source, and a shaft for rotating the shaft by forward and backward rotation of the air motor, and a shaft for linking a nut that is screwed onto the shaft to the air motor. The air motor is provided with an air relief valve for preventing an excessive expansion of the diameter of the holding plate, which is provided with a plurality of grip plates that expand and contract in diameter by contacting and separating from the inner surface of the hollow cylindrical element through a link mechanism by directional movement. Which is a means for solving the problems. Further, in the present invention, in place of the link mechanism, a single gripping disc, a diameter expansion / contraction of the disc, a wedge operating nut arranged inside and outside via a conical surface, and a plurality of tops in the axial direction are provided. It is of a wedge type which is designed to be carried out by relative movement, and is a means for solving the problem. Further, the present invention has a structure in which a gripping plate or a gripping disk for gripping the element by frictional force and a mechanism for moving the gripping plate or the gripping disk are dually provided in the axial direction of the element including the air motor. It is a means.

[0005]

According to the present invention, one end of the link is held at a fixed position by the shaft supporter portion below the link support piece by the link type gripping device, while the link operating nut screwed with the screw of the shaft is the shaft. Move up and down by rotating. The friction grip plate expands outward when the distance between the actuating nut and the shaft supporter decreases, and contracts inward when the distance increases. The rotation of the shaft is transmitted from an air motor, but the diameter of the grip plate can be increased or decreased by a control valve provided on each air hose. However, apart from removing the device from the element tube, when gripping the element tube, it is necessary to stop the frictional force grip within the allowable limit of the strength of the tube, which is the case when the working air pressure on the expansion side exceeds the set value. Guaranteed by an air relief valve that acts as a pressure regulator. Further, even if the air hose leaks for some reason, the link operating nut does not move unless the shaft rotates, so that the current state is maintained and there is no risk of dropping during gripping and handling.

According to the present invention, the wedge type gripping device causes the wedge connected by the nut and the cap nut to move up and down by the vertical movement of the wedge operating nut screwed at the screw portion of the shaft by the rotation of the shaft by the air motor. Will move. When the wedge descends, the wedge comes into contact with the wedge at a conical surface, and the plurality of divided pieces inside the gripping disk move radially outward to expand the diameter of the rubber gripping disk on the outside. When the wedge moves upward, the top of the top can be reduced in diameter by the elastic force of the rubber and the gripping device can be removed. In this case as well, as with the link type gripping device, the excessive expansion of the diameter when gripping the diameter is prevented by the air relief valve, and the disk operating nut is screwed to the shaft for safety maintenance in case of air leak so that the disk operating nut does not move indefinitely. Therefore, it is guaranteed in the same manner as the device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments of the drawings. FIGS. 1 to 4 show a first embodiment of the present invention. A grip plate 15 whose outer surface is formed into an arcuate curved surface in accordance with the inner diameter of a cylindrical filter element 16 made of a ceramic tube or the like.
The link mechanism having three sheets includes a link 13 arranged between the grip plate 15 and the link holding cylinder 22, a link support piece 9 as a pin joint portion arranged on the air motor mounting lower plate,
Link holding plate 14 inside the gripping plate 15, link holding cylinder 2
2, a link actuating nut 24 screwed into the shaft 23 and a shaft coupling 10 for connecting the shaft 23 to the air motor side with the shaft supporter 11 interposed. On the other hand, on the side of the air motor 1 that applies a rotational force to the shaft 23, an air motor lower flange 2 that fixes the air motor 1 is arranged between the air motor mounting upper plate 4 and the lower plate 3, and is connected to the link portion side. The load gripped by these link parts is transmitted to the top eye nut 17 through the upper and lower plate fixing bolts 5.
Further, the air motor 1 is connected by a flexible air hose 20 to a diameter-expanding air control valve 18, a diameter-reducing air control valve 19, an air relief valve 8 for pressure regulation, and the like.

In this structure, one end of the link 13 is held at a fixed position in the shaft supporter 11 portion under the link support piece 9, while the link operating nut 24 screwed with the shaft 23 is the shaft 23. Move up and down by rotating. Further, when the distance between the link operating nut 24 and the shaft supporter 11 is reduced, the link 13 moves horizontally and expands the grip plate 15 to the outside, that is, to the diameter expansion side. On the other hand, the link operating nut 24 and the shaft supporter 1
When the distance from 1 is increased, the grip plate 15 moves to the vertical side and moves to the inside, which is the diameter reduction side. The rotation of the shaft 23 is transmitted from the air motor 1 through the coupling 10, but the diameter expansion and contraction of the grip plate 15 are performed by the air expansion side air inlet 6 and the diameter reduction side air inlet 7 of the air motor 1, respectively.
The air motor 1 can be rotated forward and backward by operating the diameter-expanding air control valve 18 and the diameter-reducing air control valve 19 provided in the middle of the air hose 20 connected to 1.

As described above, in the present invention, the diameter of the grip plate 15 is increased,
Since the diameter reduction is performed by using the air motor using the flexible air hose 20, it is possible to operate the control valves 18 and 19 which are allowed by lengthening the air hose 20, so that a large plant requiring remote operation. In, it is considered to be a great advantage. In terms of safety and reliability, when the cylindrical filter element 16 that is the object to be gripped is gripped for handling, the frictional force grip is used to stop the stress within the allowable limit corresponding to the material of the element 16. In this case, air pressure control is extremely important, but in the case of the present embodiment, by using an air relief valve 8 that operates in a safe area, an excessive increase in air pressure on the diameter expansion side is suppressed. Since the structure allows it, the diameter is expanded to a certain pressure (to a certain inner diameter) and then stopped. Therefore, the element is not damaged. Further, if the air hose 20 leaks or is cut for some reason during handling, the conventional airbag system has a drawback that the gripping force immediately decreases.
In this embodiment, since the shaft 23 does not rotate inadvertently and the link actuating nut 24 does not move, the danger that the gripping force is lowered and the element falls is eliminated.

5 to 8 relate to a wedge type gripping device as a second embodiment of the present invention. The wedge type gripping device having the friction gripping disc 33 whose diameter is smaller when the diameter is smaller than the inner diameter of the cylindrical filter element 16 (when the wedge is not operating) is a wedge 27, 8 having a conical outer surface. Tops 29 each having a conical surface that is divided into two parts and that matches the outer peripheral surface of the wedge 27,
A wedge operating nut 2 attached to the wedge 27 via a cap nut 28 to move the wedge 27 up and down.
6, a shaft 23 screwed into the nut 26 and rotated by the air motor 1, an air motor mounting lower plate 3 and a disk 3
It has a disk support piece 25 that connects three parts and a coupling 10 that connects an air motor to the shaft 23, and also has an air motor part and an eye nut 17 in exactly the same manner as described in the link type gripping device.

Next, the operation of the embodiment constructed as described above will be described. If the air from the air pressure source 21 is selectively introduced to rotate the air motor 1 and the shaft 23 rotates through the coupling 10, the shaft is rotated. By the vertical movement of the disk actuating nut 26 screwed to 23, the wedge 27 connected to the nut 26 via the cap nut 28 moves vertically. When the wedge 27 descends, the outer peripheral surface of the wedge 27 is in contact with the inner peripheral surface of the cone, and the eight pieces 29, which are inside the gripping disc 33, move radially outward and are arranged outside them. The diameter of the rubber gripping disk 33 is increased. Conversely, when the wedge 27 moves upward,
9 is reduced in diameter toward the center by the elastic force of the rubber of the disc 33, and the disc 33 loses the frictional force and can be removed from the cylindrical filter element 16. Also in the case of the present embodiment, similarly to the case of the link type described above, the damage of the element pipe due to the excessive diameter expansion at the time of the diameter expansion grip is effectively avoided by the air relief valve of the air motor part. Also, in the case of leakage or disconnection of the air hose 20, the disk actuating nut 26 screwed into the shaft 23 does not move even during gripping and handling, so that safety is similarly ensured. .

FIG. 9 shows a third embodiment of the link type double gripping device, which has been proposed to further improve reliability. That is, the friction grip plate 15 is arranged in the axial direction of the cylindrical filter element 16 so as to sandwich the two air motors 1, and the air hose organizing cup 34 for organizing the air hoses 20 for the two air motors and the eye nut 17 are arranged.
Other than that, the link type gripping device is assembled in a substantially doubled manner. The operation of the present embodiment is the same as that of the single link type gripping device, and therefore its explanation is omitted. However, since each air motor grips the cylindrical filter element 16 independently, even if any piping system is damaged, The remaining air motor can perform the gripping operation, and the reliability is improved accordingly.

[0013]

As described in detail above, according to the present invention, the link mechanism or the wedge or the top mechanism is used to combine the gripping portion for expanding and reducing the diameter with the air motor having the pressure adjusting function. Both types can be remotely operated compared to the conventional type, and can be guaranteed by an air relief valve that has a pressure regulating function so that the diameter expansion to secure the gripping force can be performed within the allowable stress range of the element pipe. Since there is no loss of gripping force even during handling gripping due to leakage, disconnection, disconnection, etc. of the piping system, there are many advantages that there is no danger of dropping or the like. Furthermore, the reliability is remarkably increased by adopting the double gripping device.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a link type gripping device according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged view of part A in FIG.

FIG. 4 is a plan view of an air motor mounting portion of the link type gripping device according to the first embodiment of the present invention.

FIG. 5 is a vertical sectional view of a wedge type gripping device according to a second embodiment of the present invention.

6 is an enlarged sectional view of a wedge of the wedge type gripping device in FIG.

FIG. 7 is a plan view of the 8-division frame of the wedge-type gripping device in FIG.

FIG. 8 is a vertical cross-sectional view of the 8-divided frame in FIG.

FIG. 9 is a vertical sectional view of a double grip link type grip device according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Air motor 2 Air motor lower flange 3 Air motor mounting lower plate 4 Air motor mounting upper plate 5 Upper and lower plate fixing bolts 6 Expanding side air inlet 7 Contracting side air inlet 8 Air relief valve 9 Link support piece 10 Coupling 11 Shaft supporter 12 Fixing bolt 13 link 14 link holding plate 15 gripping plate 16 cylindrical filter element 17 eye nut 18 diameter expansion air control valve 19 diameter reduction air control valve 20 air hose 21 air source 22 link holding cylinder 23 shaft 24 link operating nut 25 disk support piece 26 wedge Operating nut 27 Wedge 28 Cap nut 29 Top 30 Upper plate 31 Lower plate 32 Coupling bolt 33 Gripping disc 34 Air hose organizing cup

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yajima et al. 1-1 No. 1 Satinouramachi, Nagasaki City Mitsubishi Heavy Industries Ltd. Nagasaki Shipyard Co., Ltd.

Claims (3)

[Claims] 1. An air motor, which rotates forward and backward by an air source,
A plurality of shafts that rotate the shaft by forward and reverse rotations of the air motor and axially move a link actuating nut that is screwed onto the shaft toward and away from the inner surface of the hollow cylindrical element through a link mechanism to expand and contract the diameter. 2. A hollow cylindrical element gripping device, comprising: a grip plate, and the air motor is provided with an air relief valve for preventing excessive expansion of the grip plate. 2. In place of the link mechanism, a single gripping disc, a diameter expansion / contraction of the disc, a wedge operating nut arranged inside and outside via a conical surface, and an axial direction of a plurality of tops. The hollow cylindrical element gripping device according to claim 1, characterized in that it is of a wedge type adapted to be moved by relative movement. 3. A grip plate or a grip disk for gripping an element by frictional force, and a mechanism for moving each of the grip plates or disks, which are doubly provided in the axial direction of the element including an air motor. The hollow cylindrical element gripping device described.