JP3182355U - Threaded member loosening device - Google Patents

Abstract

The present invention provides a device that can be compactly and easily attached without requiring hammering and can loosely tighten a threaded member in a short time.
A loose tightening device for a threaded member includes a base 10 having a fitting hole 12 concentric with the threaded member at a central portion and screwed to a main body, and a fitting hole 12 of the base 10. It is comprised from the rotation arm 20 provided with the cylindrical part 22b fitted so that rotation is possible, and the latching | locking part 23b latched to a screwed member, and the hydraulic cylinder 30 which connected the base 10 and the rotation arm 20. FIG. Has been. Two hydraulic cylinders 30 are arranged horizontally symmetrically with respect to the center of the threaded member. The cylinder body 31 is connected to one end of a support lever 40 connected to the base 10 by a pin 43 by a pin 33a. Is provided with a vertical pin 34a and connected to a fitting recess 21e provided on a stepped attachment portion 21a provided on the rotating arm 20.
[Selection] Figure 3

Description

  The present invention relates to a loose fastening device for a threaded member that is screwed vertically into a main body.

For example, in thermal power plants and nuclear power plants, various large valves such as control valves are provided in the steam circuit to the turbine, and they are used under severe conditions such as high differential pressure and high temperature (for example, patents). Reference 1).
As shown in FIG. 7, the control valve 50 is provided with a cage 52 having a disk 53 inside a body (main body) 51, the upper side being closed by a bonnet 54, and an inlet channel 51a and an outlet flow on the left and right sides. A path 51b is formed. A stem 55 fixed to the upper end of the disk 53 is inserted through the center of the bonnet 54 and connected to an actuator (not shown) provided at the upper end of the body 51.

The bonnet 54 is held by a retainer (threaded member) 56 that is screwed into a female screw 51 d formed at the upper end of the body 51. A packing 58c is provided at the upper part of the retainer 56, a packing 57 is provided at the lower part, and a stem packing 58a is provided at the stem 55.
The control valve 50 controls the temperature of the main steam from the boiler, and is periodically disassembled to maintain accuracy, and inspection and repair of interior items such as the cage 52 are performed.

In disassembling the control valve 50, it is necessary to remove the retainer 56 from the female screw 51d and take out the bonnet 54. Since the retainer 56 is fastened to the female screw 51d with a predetermined torque, a dedicated retainer wrench 60 is used for the removal.
As shown in FIG. 8, the retainer wrench 60 has a locking member 62 fixed to the center of a long arm member 61, and a claw 62 a is attached to the lower end of the locking member 62. Yes.
And when removing the retainer 56, the nail | claw 62a is latched by the locking groove 56a formed in the upper end part of the retainer 56, and the front-end | tip part of the arm material 61 is pulled with a chain block, or is struck with a hammer. Thus, the arm member 61 is rotated to loosen the screw.

JP-A-01-210669

By the way, in general, a large valve such as the above-described control valve is provided with a plurality of pipes, a space is small, and the arm member 61 of the retainer wrench 60 cannot be made long (1 m or more).
In addition, the packing 57 under the retainer 56 is almost in a state of being bitten by the threaded portion of the retainer 56 because internal pressure may be applied.
For this reason, the work of loosening the screws of the retainer 56 is difficult only with the chain block, and the hammer is used in combination with the hammer, but the hammer is hit 100 times or more. It requires a lot of hits and a lot of time.
In addition, since the hammer is struck many times, due to fatigue, the hammer may not hit the arm material 61, causing the body to collapse and toppling, or the hammer hitting an existing pipe or the like, causing damage to safety. there were.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a device that can be compactly and easily attached and can loosely tighten a threaded member in a short time without requiring hammering.

  In order to achieve the above-mentioned object, the screwing member loosening device of the present invention employs the following means. That is, a device for loosely tightening a threaded member to be screwed into a female screw of a body formed vertically, a base having a fitting hole concentric with the threaded member at the center and screwed to the body, A rotating arm having a cylindrical portion that is rotatably fitted in the fitting hole of the base and a locking portion that is locked to the threaded member, and a cylinder body is coupled to the base and It consists of a hydraulic cylinder that connects the tip of the rod to the rotating arm, and two hydraulic cylinders are arranged horizontally in a point-symmetric manner at the center of the threaded member.

Here, the main body is not limited to a control valve or a similar large valve, but means a device in which a female screw is formed vertically. The threaded member refers to a member having a male screw that is screwed into the vertical female screw.
The base is provided with a fitting hole that rotatably supports the rotating arm at the center and supports the cylinder body of the hydraulic cylinder, and is attached to the main body with a bolt.

The rotating arm includes a locking portion that is locked to the threaded member and a cylindrical portion that is fitted to the fitting hole of the base so that the tip of the rod of the hydraulic cylinder can be connected. It may be integrally formed by casting or forging, or may be welded by combining members.
In addition, since machining is generally complicated when integrated, an arm having an insertion hole at the center portion and connected to a rod of a hydraulic cylinder, as described in claim 2, An adapter that has a cylindrical portion that is inserted through the insertion hole and fits into the fitting hole of the base and is screwed to the arm body, and a locking portion that is locked to the threaded member, and is screwed to the adapter. It is desirable to comprise from the latching body.

The insertion hole of the arm body is concentric with the fitting hole of the base, and has the same diameter as or larger than the fitting hole. The adapter is screwed to the arm body, but is preferably attached with a flange having a diameter larger than the insertion hole.
Further, the locking portion of the locking body may be determined so as to be fitted in a form for rotation attached to the threaded member, for example, a radial groove, a hexagonal hole, or a square hole.

  Two hydraulic cylinders are arranged horizontally on the base and the rotating arm so as to be symmetrical with respect to the center of the threaded member. The connecting means of the hydraulic cylinder and the horizontal structure are not particularly limited. However, as described in claim 3, the cylinder body is connected to the reaction force receiving portion provided by extending two diagonally on the base with pins. And connecting the tip of the rod to a mounting portion provided extending diagonally to the rotating arm, and the reaction force receiving portion when the rotating arm is assembled to the mounting portion. It is desirable to provide a step so as to have the same height.

  The hydraulic cylinder connecting means may have various configurations. As described in claim 4, the hydraulic cylinder connecting means includes a mounting bracket having a vertical pin at the tip of the rod of the hydraulic cylinder and an arm of a rotating arm. It is good to form the fitting recessed part which this vertical pin fits in the attachment part of a body. The cylinder body of the hydraulic cylinder is pin-connected to one end of a support lever that is rotatably connected to the reaction force receiving portion of the base, and the other end of the support lever contacts the side surface of the base It is good to have provided.

  The hydraulic cylinder may be attached in the same manner when the threaded member is loosened and when the screwed member is fastened. However, as described in claim 5, the fitting recess of the rotating arm is provided on the left and right sides of the tip of the arm body. When the screwed member is assembled, it is desirable that the vertical pin at the tip of the rod of the hydraulic cylinder is fitted into the fitting recess on the opposite side to the removal.

  As described above, the loose tightening device for a threaded member of the present invention has a fitting hole in the center and a base that is screwed to the main body, and is rotatably fitted in the fitting hole of the base. A rotating arm having a cylindrical portion and a locking portion for locking to a threaded member, and a hydraulic cylinder in which two bases and a rotating arm are horizontally arranged symmetrically with respect to the center of the threaded member, Since it comprised, the threaded member can be loosely fastened in a short time, without giving an impact with a hammer like the past. In addition, since the threaded member is rotated by horizontal force from two locations on the circumference, unnecessary force is less likely to act on the screw portion, and the installation space for the apparatus can be reduced.

  According to a third aspect of the present invention, in the hydraulic cylinder, two cylinders are connected to the reaction force receiving portion provided on the base by extending two diagonally with a pin, and two hydraulic cylinders are diagonally connected to the rotating arm. If the tip of the rod is connected to the extended mounting part, and the mounting part has a step so that it is at the same height as the reaction force receiving part when the rotating arm is assembled to the base, Since the cylinder can be easily and horizontally disposed and can be rotated at a position close to the screw of the threaded member, an unreasonable force over the threaded portion does not occur.

  According to a fourth aspect of the present invention, a mounting bracket having a vertical pin is provided at the tip of the rod of the hydraulic cylinder, and the vertical pin is attached to the mounting portion extending from the arm body of the rotating arm. A fitting recess is formed, and the cylinder body of the hydraulic cylinder is pin-connected to one end of a support lever rotatably connected to a reaction force receiving portion of the base, and the other end of the support lever is a base If the abutting portion that abuts on the side surface is provided, the attachment / detachment of the hydraulic cylinder becomes extremely simple, and the time for attaching / detaching the apparatus can be shortened.

  Further, as described in claim 5, when the fitting recess of the rotating arm is formed on the left and right of the distal end of the arm body, when assembling the threaded member, If the vertical pin at the tip of the rod is fitted, the hydraulic cylinder can be easily attached and detached, and the threaded member is always loosely tightened with the pressure oil that pushes out the rod, so that the hydraulic cylinder can be made compact.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. It is a components expansion | deployment perspective view of the loose fastening apparatus of a screwed member. It is the perspective view which looked at the adapter 22 from the bottom same as the above. It is the perspective view which looked at the latching body 23 from the downward direction similarly. FIG. 3 is an overall plan view showing a mounting state of the hydraulic cylinder when tightening the threaded member. It is front sectional drawing of a control valve. It is a perspective view of a retainer wrench.

In the following, an embodiment of the device for loosely tightening a threaded member according to the present invention will be described with reference to an example in which a retainer 56, which is a threaded member screwed into a body 51 of a regulating valve 50, which is the body of the regulating valve in a thermal power plant, is attached and detached. This will be described with reference to FIGS.
FIG. 1 is a plan view showing the entirety of a loose fastening device for a threaded member, and FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is an exploded perspective view of the component parts.
This loose tightening device includes a base 10 attached with a bolt 15, a rotary arm 20 attached to the base 10 so as to be rotatable, and locked to a retainer 56 of a regulating valve that is a threaded member, The hydraulic cylinder 30 is configured to rotate the arm 20.

  The base 10 has a disc-like shape and is extended with reaction force receiving portions 11 provided with pin holes 11a at two opposite positions on the outer periphery. And the fitting hole 12 is provided in the center part, the some counterbore 13 is formed in the circumference | surroundings, and the bolt hole 14 is provided.

The rotating arm 20 is integrally formed by attaching an arm body 21, an adapter 22, and a locking body 23 with bolts 25 and 26, respectively.
The arm body 21 has a disc shape having an insertion hole 21c having the same diameter as the fitting hole 12 of the base 10 at the center portion, and attachment portions 21a are extended at two opposite positions on the outer periphery. The front end side of the mounting portion 21 a is formed low by providing a stepped portion 21 b so as to be the same as the height of the base 10, and attached to the front end of the rod 32 of the hydraulic cylinder 30 on the left and right sides of the front end portion. Fitting recesses 21e that are fitted into the vertical pins 34a are provided. A plurality of screw holes 21d are provided around the insertion hole 21c.

The adapter 22 is shaped like a dish with a flange, and as shown in FIG. 4 as viewed from the bottom side, the adapter 22 has a flange 22a provided with a plurality of bolt holes 22f and a bottom hole 22d at the center. And a cylindrical portion 22b having a bottom portion 22c. The outer diameter of the inner cylinder part 22b is set to a dimension that allows the inner cylinder part 22b to be rotatably fitted in the fitting hole 12 of the base 10. Here, the insertion hole 21c of the arm body 21 has the same diameter.
The bottom portion 22c is provided with grooves 22e at four locations around the bottom hole 22d, and a plurality of screw holes 22g around the bottom hole 22d. The adapter 22 is fastened to the screw hole 21 d of the arm body 21 through the bolt hole 22 f with the bolt 25.

The locking body 23 includes a cylindrical portion 23 a that fits in the adapter 22 and a locking portion 23 b that projects from the lower portion. The locking portion 23 b engages with a locking groove 56 a of the retainer 56. Then, the groove 22e of the adapter 22 is inserted and fastened to the adapter 22 with a bolt 26.
The bolt 26 is fastened to the screw hole 22g of the bottom portion 22c of the adapter 22 through a plurality of bolt holes 23c provided in the cylindrical portion 23a. FIG. 5 is a perspective view seen from the lower side.

  The retaining plate 24 is for holding the rotating arm 20 from above, and has a disk shape. A bonnet is formed by a through hole 24a through which the stem 55 is inserted in the center and bolts (not shown) on both sides thereof. Bolt holes 24b are provided for attaching to the 54 screw holes 56b.

  The hydraulic cylinder 30 includes a cylinder body 31, a rod 32, and mounting brackets 33 and 34. The mounting bracket 33 is fixed to the cylinder body 31 and includes a pin 33a, to which one end of the support lever 40 is coupled. On the other hand, the mounting bracket 34 is provided at the tip of the rod 32, and a vertical pin 34 a that engages with the pin receiver 21 e of the arm body 21 is fixed thereto.

The support lever 40 is composed of two upper and lower plate-shaped lever members 41 and pins 42 and 43 that connect the lever members 41 to each other, and one end is connected to a pin 33 a of the mounting bracket 33 of the hydraulic cylinder 30. . The connecting pin 43 at the center is connected to the reaction force receiving portion 11 of the base 10 during use, and the pin 42 functions as a contact portion that contacts the side surface of the base 10.
Although not shown, the hydraulic cylinder 30 is connected to a portable power unit having an oil tank, an electric hydraulic pump, and a control valve as a unit by a hydraulic hose. Can be used.

Next, the operation | work which removes the retainer 56 of the control valve 50 (FIG. 7) using this apparatus is demonstrated.
FIG. 7 shows a state where the actuator has already been removed from the attachment body 59.
From this state, when the bolt 58b is first loosened and removed from the bonnet 54, the bolt 59a is removed, and the attachment body 59 is lifted upward by the chain block and removed from the body 51. Then, the packing 58c and the stem packing 58a are taken out.

Next, the base 10 is horizontally held from above so that the stem 55 is positioned at the center of the fitting hole 12 and placed on the upper end of the body 51, and the bolt 15 is screwed from the bolt hole 14 into the screw hole 51c and fastened. To do.
Next, while fitting the cylindrical portion 22b of the adapter 22 into the fitting hole 12 of the base 10, the rotating arm 20 in which the adapter 22 and the locking body 23 are assembled to the arm body 21 in advance is fitted. The locking portion 23 b is fitted in the locking groove 56 a of the retainer 56 and placed on the base 10.
When the engaging portion 23b is fitted into the engaging groove 56a, the rotating arm 20 is rotated so that the attachment portion 21a is substantially perpendicular to the reaction force receiving portion 11 of the base 10. Do.

  Subsequently, the stop plate 24 is assembled from above the locking body 23 while the stem 55 is inserted through the through hole 24 a, and a bolt is screwed from the bolt hole 24 b into the screw hole 56 b of the bonnet 54 and fastened.

Next, the hydraulic cylinder 30 to which the support lever 40 is connected is attached to the base 10.
In this operation, first, the support lever 40 is connected to the pin hole 11 a of the reaction force receiving portion 11 of the base 10 with the connection pin 43, and the support lever 40 is rotatable about the connection pin 43. Then, the pin 34 a attached to the mounting bracket 34 at the tip of the rod 32 of the hydraulic cylinder 30 is fitted into the fitting recess 21 e of the rotating arm 20.

When the two hydraulic cylinders 30 are attached in this way, both the hydraulic cylinders 30 are operated to extend the rod 32. As a result, the support lever 40 rotates about the connecting pin 43, and the pin 42 that is the contact portion of the support lever 40 contacts the side surface of the base 10. FIG. 1 shows the state at this time.
When the hydraulic cylinder 30 is further operated from this state, the hydraulic pressure rises and the rod 32 extends, and the rotating arm 20 rotates in the direction of the arrow in FIG. 1 to rotate the retainer 56.
When the screw of the retainer 56 is loosened, the rod 32 of the hydraulic cylinder 30 is reduced, the stop plate 24 is removed, and the hydraulic cylinder 30 to which the rotating arm 20 and the support lever 40 are connected is removed.
Since the retainer 56 can be rotated with a light force in the loosened state, the retainer 56 is detached from the body 51 by using a short wrench having a locking portion that is locked to the locking groove 56a.

  The control valve 50 is assembled by a process reverse to the above operation after the maintenance and inspection in the control valve 50 such as the cage 54 and the disk 54b are completed. In this case, as shown in FIG. 6, in the hydraulic cylinder 30, the pin 34a at the tip of the rod 32 is fitted into the fitting recess 21e on the opposite side. Thereby, when the hydraulic cylinder 30 is operated, as shown by an arrow in FIG. 6, the rotating arm 20 can be rotated clockwise and the retainer 56 can be tightened.

DESCRIPTION OF SYMBOLS 10 Base 11 Reaction force receiving part 11a Pin hole 12 Fitting hole 13 Counterbore 14 Bolt hole 15 Bolt 20 Rotating arm 21 Arm body 21a Mounting part 21b Step part 21c Insertion hole 21d Screw hole 21e Pin receiving 22 Adapter 22a Flange 22b Inner cylinder portion 22c Bottom portion 22d Bottom hole 22e Groove 22f Bolt hole 22g Screw hole 23 Locking body 23a Cylindrical portion 23b Locking portion 23c Bolt hole 24 Stop plate 24a Through hole 24b Bolt hole 25 Bolt 26 Bolt 30 Hydraulic cylinder 31 Cylinder body 32 Rod 33 Bracket 33a Pin 34 Mounting bracket 40 Support lever 41 Lever material 42 Pin (contact part)
43 Connecting Pin 50 Control Valve 51 Body (Main Body)
51a Inlet channel 51b Outlet channel 51c Screw hole 51d Female screw 52 Cage 53 Disk 54 Bonnet 55 Stem 56 Retainer (screwed member)
56a Locking groove 56b Screw hole 57 Packing 58 Packing presser 58a Stem packing 58b Bolt 58c Packing 59 Mounting body 59a Bolt 60 Retainer wrench 61 Arm material 62 Locking material 62a Claw

Claims (5)

   A device for loosely tightening a threaded member to be screwed into a female screw of a body formed vertically, a base having a fitting hole concentric with the threaded member at the center and screwed to the body, A rotating arm having a cylindrical portion that is rotatably fitted in the fitting hole of the base and a locking portion that is locked to the threaded member, and the cylinder body is connected to the base and the turning is performed. An apparatus for loosely tightening a threaded member, comprising: a hydraulic cylinder for connecting a tip end of a rod to an arm, wherein the two hydraulic cylinders are horizontally arranged point-symmetrically at the center of the threaded member.   The rotating arm includes an arm body having an insertion hole at a central portion and an attachment portion connected to a rod of a hydraulic cylinder, and a cylindrical portion that is inserted through the insertion hole and fits into a fitting hole of a base. The adapter according to claim 1, comprising: an adapter provided and screwed to the arm body; and a locking body provided with a locking portion to be locked to the threaded member and screwed to the adapter. A member tightening device.   The hydraulic cylinder is connected to a reaction force receiving portion provided by extending two diagonally on the base with a pin and a mounting portion provided by extending two diagonally to the rotating arm. 2. A step is provided so that the tip of the rod is connected, and the mounting portion is provided with a step so as to be at the same height as the reaction force receiving portion when a rotating arm is assembled to the base. A loose tightening device for a threaded member as described.   A mounting bracket having a vertical pin is provided at the tip of the rod of the hydraulic cylinder, and a fitting recess into which the vertical pin fits is formed in the mounting portion extended to the arm body of the rotating arm, The cylinder body of the hydraulic cylinder is pin-connected to one end of a support lever that is rotatably connected to the reaction force receiving portion of the base, and the other end of the support lever is provided with a contact portion that contacts the side surface of the base 4. The loose tightening device for a threaded member according to claim 3, wherein the device is tightened.   The fitting recesses of the rotating arm are formed on the left and right sides of the tip of the arm body, respectively, and the vertical pin at the tip of the rod of the hydraulic cylinder is placed in the fitting recess on the opposite side to when removing the screwed member. 5. The loose tightening device for a threaded member according to claim 4, wherein the device is fitted.

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