JP7381194B2 - Pressure test device for pressure equipment using variable jig for inspection equipment, pressure test method for pressure equipment using variable jig for test equipment, variable jig for assembly equipment and variable jig for processing equipment - Google Patents

Description

The present invention relates to, for example, a variable jig for an inspection device used for pressure-proof inspection of valves, a pressure-proof inspection device and a pressure-proof inspection method for pressure equipment using the same, a variable jig for an assembly device, and a variable jig for a processing device. Regarding.

Conventionally, for example, when performing pressure resistance tests on pressure equipment such as valves, the body of the valve to be inspected is generally supported from both sides, and fluid pressure is applied inside to check for leaks to the outside. It looks like this. In this way, when holding objects such as objects to be inspected as workpieces and performing various tests such as pressure resistance tests, or performing assembly and processing, it is necessary to hold objects such as objects with different nominal diameters, external shapes, and sizes. In this case, various devices are used to accommodate these differences.

As a device used to hold an object, for example, a pressure testing device for a valve is disclosed in Patent Document 1. This inspection device has first and second pipes connected to first and second ports of a check valve, which is an object to be held, and a first pipe that supports these first and second pipes. It has a support part and a second support part. The distance between the first support part and the second support part is adjustable by a guide mechanism, so that valves, which are objects having different face-to-face dimensions, can be mounted and inspected.

On the other hand, when the external shape of the object to be held is approximately cylindrical or cylindrical, the object is supported from below by supports from below, and the approximately V-shaped grooves formed in the supports are used to support the object from below. Devices for placing and holding devices are generally known (for example, see Patent Document 2). In such devices, one or both of the supports are movable up and down in order to accommodate different shapes and outer diameters on both sides of the object, and the heights of both sides are adjusted and centered. It is ready to be placed.

Japanese Patent Application Publication No. 2005-98858 Japanese Patent Application Publication No. 2005-313248

The former inspection device of Patent Document 1 mainly holds flange-type check valves, and it is difficult to attach valves other than flange-types. If the target is a flangeless type valve such as a screw-in type, the valve may be held on both sides without being centered, and as a result, the valve may tilt and touch both end faces and the mounting surface of the device. Gaps may occur and leaks may occur. For this reason, it is not suitable for pressure testing when the object is a flange type valve.
Since this inspection device has a structure in which the flange of the check valve is held by sandwiching it from both sides, the entire device becomes long in the length direction, which is the direction in which the valve is sandwiched, and thus has the problem of increasing in size.

On the other hand, the latter centering device of Patent Document 2 is intended for centering when the object to be held is a cylindrical member, and is supported in a state where rotation of the object is allowed. For this reason, if the target object is a screw-in valve that has a hexagonal or octagonal shaped part on the outer periphery of the body, it will be difficult to hold the square part with the tapered support surface formed on the support, and the flow path will be In some cases, the valve may rotate and the stem mounting portion may be installed at an angle from the vertical direction. This makes it difficult to arrange a sensor for detecting leakage at an appropriate position on the stem shaft mounting part side during a pressure resistance test, and there is a possibility that leakage cannot be detected accurately.
As described above, in Patent Document 2, it is not possible to attach the object while preventing its rotation.

In addition to these, in general devices for holding objects, it is necessary to replace the jig for holding the object in order to match the shapes of both sides and the spacing between both sides, which differ depending on the object. There is. In this case, the increase in setup man-hours makes it difficult to cope with frequent replacement of workpieces with different external shapes, such as the shape of both sides or the spacing between both sides, such as in high-mix, low-volume production, for example.

The present invention was developed in order to solve the conventional problems, and its purpose is to make the entire workpiece more compact while also making it possible to hold a workpiece in a centered state while preventing it from tilting or rotating. , a variable jig for inspection equipment that can handle frequent changes in the external shape of a workpiece without the need for replacement, a pressure-resistant inspection device and method for pressure equipment such as valves using the same, and a pressure-resistant inspection method for assembly equipment. The purpose of the present invention is to provide a variable jig and a variable jig for processing equipment.

In order to achieve the above object, the invention according to claim 1 is a pressure resistance testing device for pressure equipment, which tests the pressure resistance of a workpiece consisting of pressure equipment such as a valve using a variable jig for the testing device. The tool is equipped with a jig main body that supports a workpiece, and support parts each having a support surface are provided on both sides of the jig main body. It has a support member and a pin member disposed between these support members, and the pin member is provided to be movable in the vertical direction via a motor, and the vertical movement of the pin member causes the vertical movement of both support members. This is converted into an angle change due to rotation around the fulcrum, and the approximately V-shaped taper angle formed by the support surface is adjustable to match the predetermined inclination angle of the rectangular tightening joint formed on the workpiece. In addition, the mutual height and spacing between the supporting surfaces can be set according to the difference in shape on both sides of the workpiece and the distance between the surfaces , and the inclination angle of the polygonal tightening joint formed on the workpiece can be adjusted. This is a pressure resistance testing device for pressure equipment that uses a variable jig for testing equipment that can adjust the taper angle of the support surface accordingly and perform pressure testing while a workpiece is held coaxially with the jig main body.

The invention according to claim 2 is a variable inspection device for an inspection device in which the remaining one side of the support portion is integrally formed in a substantially Y shape, and the support portion is provided to be vertically movable via a motor other than the motor. This is a pressure testing device for pressure equipment that uses a jig.

The invention according to claim 3 is a pressure resistance testing device for pressure equipment using a variable jig for a test device, which is provided on either side of a supporting portion so as to be horizontally movable via a motor.

The invention according to claim 4 is provided with a correction holder having a U-shaped portion on the front side, and the correction holder is provided movably in vertical and horizontal directions via a motor, and the interval between the U-shaped portions is adjustable. This is a pressure resistance testing device for pressure equipment using a variable jig for a testing device that is installed in a U-shaped portion and holds a workpiece non-rotatably across a protrusion formed in the centrifugal direction of the workpiece.

The invention according to claim 5 inputs unique data given to a workpiece consisting of a pressure device such as a valve from an input section, and supports the workpiece in accordance with the inclination angle of the tightening joint part of the workpiece according to the input data. An inspection in which the workpiece is held coaxially with the jig body by adjusting the taper angle of the surface and moving at least one supporting surface in the vertical and horizontal directions, and the pressure resistance test is performed in this state. This is a pressure resistance test method for pressure equipment using a variable equipment jig.

The invention according to claim 6 is provided with a jig main body that supports a workpiece to be assembled by various assembling devices, a support part having a support surface is provided on both sides of the jig main body, and a support part on one side is provided with a support part having a support surface. , has a pair of plate-shaped support members pivotally supported at a fulcrum, and a pin member disposed between these support members, and this pin member is provided so as to be movable in the vertical direction via a motor. The vertical movement of the pin member is converted into an angular change due to the rotation of both support members around their fulcrums, and the approximately V-shaped taper angle formed by the support surfaces is used to create a predetermined square fastening joint formed on the workpiece. The assembly device can be adjusted according to the inclination angle of the workpiece, and the mutual height and spacing between the supporting surfaces can be set according to the difference in shape on both sides of the workpiece and the distance between the surfaces. This is a variable jig for an assembly device , which is a device for inserting an operating shaft part into a shaft mounting part formed in a .

The invention according to claim 7 is provided with a jig main body that supports a workpiece to be processed by various processing devices, a support portion having a support surface is provided on both sides of the jig main body, and a support portion on one side is provided with a support portion having a support surface. has a pair of plate-shaped support members pivotally supported at a fulcrum, and a pin member disposed between these support members, and this pin member is provided so as to be movable in the vertical direction via a motor, This vertical movement of the pin member is converted into an angular change due to the rotation of both support members around their fulcrums, and the roughly V-shaped taper angle formed by the support surfaces is used to adjust the angle of the rectangular tightening joint formed on the workpiece. The processing device is provided so that it can be adjusted according to a predetermined inclination angle, and the mutual height and spacing between the supporting surfaces can be set according to the difference in shape on both sides of the workpiece and the distance between the surfaces. This is a variable jig for processing equipment , which is a device that forms a female thread on the inner periphery of a shafting part formed on a workpiece .

According to the invention according to claim 1, the lengthwise dimension can be reduced by having a jig body that supports a workpiece and supporting the workpiece from below on the support surfaces of the support parts on both sides of the jig body. By making it shorter, the overall size can be made more compact. A pin member is arranged between the support members, and this pin member is provided so as to be movable in the vertical direction via a motor, and the taper angle formed by the support surface of the support part on one side is adjusted to the rectangular tightening joint of the workpiece. By making it possible to adjust the taper angle of the support surface according to the inclination angle of the are brought into close contact with each other to prevent rotation about the axis in the mounting direction. Furthermore, the mutual height and spacing between the supporting surfaces can be set according to the shape difference on both sides of the workpiece and the distance between the surfaces, thereby preventing the workpiece from tilting in the axial direction and supporting it in a centered state. This allows the workpiece to be inspected by various inspection devices while the workpiece is being held. Furthermore, when inspecting a wide variety of workpieces in small quantities, even if the outer shape of the workpiece changes frequently, such as the shape of both sides or the spacing between both sides, it is possible to inspect any shape without having to replace the jig itself. Since it is possible to hold several workpieces, it is possible to reduce the number of setup steps during inspection.
By using a jig main body with a short longitudinal dimension, it is possible to provide a vertical and compact pressure testing device. If the workpiece is a pressure device such as a flangeless valve such as a screw-in valve, the workpiece should be centered while preventing rotation about the flow path axis and preventing tilting of the flow path in the axial direction. Support is possible while preventing positional shift. As a result, even if the workpiece is a completed valve or a semi-finished product that is being assembled, and the shapes and distances between the two sides of the workpiece are different, pressure resistance tests can be easily performed while being automated. It becomes possible.

According to the invention according to claim 2, while simplifying the structure of the remaining one side of the support part, it is possible to support a circular part such as a cylindrical part provided on the workpiece while preventing it from shifting. The workpiece can be centered and positioned on both sides of the support part on the taper angle adjustment side. By providing the remaining one side of the support section so as to be vertically movable via another motor, it is possible to support the workpiece in a centered state with the heights of the support surfaces aligned.

According to the invention according to claim 3 , by providing one side of the support part so as to be horizontally movable via a motor, the mutual spacing between the support parts can be set, and even for workpieces having different distances between surfaces, both sides can be moved. It can be installed in a stable state by supporting the surrounding area.

According to the invention according to claim 4 , by holding the workpiece unrotatably by sandwiching the protrusion part between the U-shaped parts of the correction holder according to the position and size of the protrusion part of the workpiece, the displacement of the protrusion part can be prevented. It becomes possible to maintain the orientation while preventing this, and to perform various inspections through this protrusion.

According to the invention according to claim 5 , by inputting workpiece-specific data consisting of pressure equipment such as valves, the inclination angle of the tightening joint, the shape and surface of both sides of the workpiece, which differ for each workpiece, can be determined according to this input data. By setting the taper angle of the support surface and the amount of movement of the support surface in the vertical and horizontal directions according to the distance between them, the workpiece can be coaxially held at a predetermined position on the jig body, allowing for easy pressure resistance while achieving automation. It becomes possible to inspect.

According to the invention according to claim 6 , the lengthwise dimension can be reduced by comprising a jig body that supports a workpiece and supporting the workpiece from below on the support surfaces of the support parts on both sides of the jig body. By making it shorter, the overall size can be made more compact. A pin member is arranged between the support members, and this pin member is provided so as to be movable in the vertical direction via a motor, and the taper angle formed by the support surface of the support part on one side is adjusted to the rectangular tightening joint of the workpiece. By making it possible to adjust the taper angle of the support surface according to the inclination angle of the support surface, the taper angle of the support surface can be easily adjusted by the operation of the motor.Through automation, continuous and rapid assembly is possible, while tightening joints on the support surface can be easily adjusted. are brought into close contact with each other to prevent rotation about the axis in the mounting direction. Furthermore, the mutual height and spacing between the supporting surfaces can be set according to the shape difference on both sides of the workpiece and the distance between the surfaces, thereby preventing the workpiece from tilting in the axial direction and supporting it in a centered state. This makes it possible to assemble the workpiece using various assembly devices while holding the workpiece. Moreover, even when the shape of both sides of a workpiece or the spacing between both sides changes frequently during high-mix, low-volume production, it is possible to hold workpieces of any shape without the need for replacement. , it is possible to reduce the number of setup steps during assembly.
The operating shaft part can be inserted into the shaft part formed on the workpiece while the workpiece is properly held, and the operating shaft part can be accurately positioned at the predetermined position on the shaft part to accommodate workpieces of various shapes. Can be installed.

According to the invention according to claim 7 , the structure includes a jig main body that supports a workpiece, and supports the workpiece from below on the support surfaces of the support parts on both sides of the jig main body, so that the lengthwise dimension can be reduced. By making it shorter, the overall size can be made more compact. A pin member is arranged between the support members, and this pin member is provided so as to be movable in the vertical direction via a motor, and the taper angle formed by the support surface of the support part on one side is adjusted to the rectangular tightening joint of the workpiece. By making it possible to adjust the taper angle of the support surface according to the inclination angle of the are brought into close contact with each other to prevent rotation about the axis in the mounting direction. Furthermore, the mutual height and spacing between the supporting surfaces can be set according to the shape difference on both sides of the workpiece and the distance between the surfaces, thereby preventing the workpiece from tilting in the axial direction and supporting it in a centered state. This makes it possible to process the workpiece using various processing devices while holding the workpiece. Moreover, even when the shape of both sides of a workpiece or the spacing between both sides changes frequently during high-mix, low-volume production, it is possible to hold workpieces of any shape without the need for replacement. , it is possible to reduce the number of setup steps during processing.
A female screw can be machined on the inner periphery of a shaft part formed on the workpiece while the workpiece is properly held, and the female screw can be accurately placed at a predetermined position on the shaft part to accommodate workpieces of various shapes. Can be formed.

FIG. 1 is a schematic cross-sectional view showing a pressure test device for pressure equipment. FIG. 2 is a perspective view showing an example of a usage state of the variable jig for an inspection device according to the present invention. FIG. 3 is a side view of FIG. 2; (a) is a partially omitted front view of FIG. 2. (b) is a partially omitted rear view of FIG. 2. (a) is a partially enlarged front view of FIG. 4(a). (b) is a schematic diagram showing the vicinity of the shaft member in (a). FIG. 2 is a block diagram showing an inspection line in a preliminary pressure test. (a) is a perspective view showing another example of the usage state of the variable jig for an inspection device. (b) is a partially enlarged front view of (a). (a) is a perspective view showing still another example of the usage state of the variable jig for an inspection device. (b) is a partially enlarged front view of (a).

Below, a variable jig for an inspection device according to the present invention, a pressure test device and a pressure test method for pressure equipment such as valves using the same, a variable jig for an assembly device, and a variable jig for a processing device will be described based on the embodiments. Explain in detail.
FIG. 1 is a schematic cross-sectional view of a pressure testing device for pressure equipment, and FIG. 2 shows an example of a usage state of a variable jig for the testing device.

The apparatus main body 1 for pressure testing of pressure equipment shown in FIG. A variable jig for the inspection device of the present invention (hereinafter referred to as jig body 81) is provided in the frame 10 (described later) of the device main body 1. It will be done.

The jig main body 81 has support parts 82, 83, motors 84, 85, 86, and 87, and the workpiece 2 is supported in a predetermined state by the support parts 82 and 83, and the workpiece 2 is subjected to a pressure resistance test. . Further, the jig main body 81 is provided with a correction holder 88.

The workpiece 2 is made up of pressure equipment such as valves, and is installed so that it can be inspected by various inspection devices. In this embodiment, a ball valve is constructed and tested for pressure resistance testing, and in particular, a semi-finished product obtained by assembling some of the components of the ball valve is used for testing. In this example, a semi-finished product is used as the work 2, but a finished product or a part may be used as the work, and any work can be used depending on the implementation.

The ball valve 2, which is a workpiece, is provided with a nominal diameter of, for example, 2 inches, and its body 40 is formed of a cast metal part, and a polygonal regular octagonal tightening joint 90 is formed on one side of the body 40. Ru. The tightening joint portion 90 is provided in such a direction that corner portions are located at the upper and lower positions, respectively, and in this case, one internal angle α1 of the tightening joint portion 90 is 140°. Here, the "angle of inclination of the tightening joint", which will be described later, refers to the angle formed by the surfaces placed on the jig main body 81 when the workpiece 2 is supported by the jig main body 81. When 90 is a regular octagon, the inclination angle β of this fastening joint 90 is 140°, which is the same as the internal angle α1. The tightening joint portion 90 may have a polygonal shape other than a regular octagonal shape, such as a regular hexagonal shape.
A cylindrical portion 92 having a predetermined outer diameter is formed on the other side of the workpiece 2 from the tightening joint portion 90 .

A shaft part 41, which is a protruding part formed in the centrifugal direction, is formed in the upper part of the body 40. A stem 42, which is an operating shaft part for rotational operation, is inserted into this shaft part 41, and from above the stem 42 is inserted. A packing retainer 43 is attached, and the stem 42 is rotatably provided in a positioned state.
Two O-rings 45 are attached to the outer periphery of the stem 42, and a sealing portion 46 is provided by these O-rings 45. In this embodiment, since the workpiece 2 is a ball valve, this sealing part 46 becomes a stem shaft sealing part of the valve.

In FIGS. 2 to 5, a jig main body 81 that supports the work 2 is provided inside the frame 10 of the apparatus main body 1. Supports 82, 83 are provided on both sides. The support parts 82 and 83 are respectively provided with support surfaces 100 and 101 that support the work 2, and the vicinity of both sides of the work 2 are placed on these support surfaces 100 and 101, so that the work 2 is supported from below.

Among the supporting parts 100 and 101 on both sides, at least one supporting part 100 has a pair of plate-shaped supporting members 102 and 103 and a pin member 104.
The support members 102 and 103 are provided in a substantially symmetrical shape, and a tapered support surface 100 is provided on the upper surface side of each support member 102 and 103 that supports the workpiece 2, and the workpiece 2 is fastened to the support surface 100. 90 is retained. The support members 102 and 103 are rotatably supported by a shaft member 105 serving as a fulcrum on a vertical mounting plate 106 provided in the vertical direction, with parts of the support members 102 and 103 overlapping each other. Cutout portions 107 and 107 are formed in the overlapping portions of the support members 102 and 103, respectively, and the pin member 104 is provided in the cutout portion 107 such that it can be placed therein.

4, FIG. 5(a), and FIG. 5(b), the pin member 104 is horizontally attached to the upper end surface of the rod 110, which is moved up and down by the motor 84, between the notch portions 107 of both the support members 102 and 103. It is installed in a state where it is arranged in the direction. The pin member 104 is provided to be movable in the vertical direction by a rod 110 via a motor 84, and its movement in the vertical direction pushes both support members 102 and 103 through a notch 107. This is converted into an angular change due to rotation of 102 and 103 about the fulcrum 105. The motor 84 is fixedly attached to a predetermined position on the vertical plate 106.

The support members 102 and 103 are rotated by a predetermined angle in opposite rotational directions according to the amount of movement of the pin member 104, and the approximately V-shaped taper angle θ formed by the support surface 100 is adjusted to match the tightening joint portion 90 of the workpiece 2. It is provided so as to be adjustable according to a predetermined inclination angle β, and the support surface 100 can support the fastening joint portion 90 of the workpiece 2 in surface contact. FIG. 5A shows a state in which the taper angle θ is set to 140°, which is an interior angle of a regular octagon.

In FIG. 4(b), the support portion 83 is integrally formed in a substantially Y shape. This support part 83 is attached to be vertically movable via a rod 111 that is moved up and down by a motor 85, and this motor 85 is arranged on the upper surface of a horizontal plate 112 that is attached to the vertical plate 106 in a direction perpendicular to the vertical plate 106. It is provided horizontally movably via a rod 113 of a motor 86 fixed on a horizontal plate 112.

In this way, the support portion 83 is provided to be movable vertically and horizontally via motors 85 and 86 that are separate from the motor 84 for adjusting the taper angle. By moving the support part 83 in the vertical and horizontal directions with respect to the support part 82 in a fixed state, the mutual relationship between the support parts 82 and 83 can be adjusted according to the difference in shape on both sides of the workpiece 2 and the dimension between the surfaces. The height and spacing can be set individually.

A rod 115 that is moved up and down by a motor 87 is provided at the lower part of the horizontal plate 112, and the horizontal plate 112 is provided so that it can be moved up and down by the motor 87 via this rod. As the horizontal plate 112 moves up and down, the support members 102 and 103 move up and down simultaneously.

By using the jig main body 81 described above in the apparatus main body 1, one side of the workpiece 2, that is, the tightening joint part 90 side, is supported by the support members 102 and 103, and the other side, the cylindrical part 92 side, is supported in the vertical and horizontal directions. By supporting the workpiece 2 with the support member 103 adjusted to the above, the workpiece 2 is coaxially held between the jig main body 81, and thereby a pressure resistance test can be performed.

In FIGS. 2 to 4, the correction holder 88 is provided within the apparatus main body 1 so as to be located near the top of the jig main body 81, and a U-shaped portion 120 is provided on the jig main body side on the forward side. . The correction holder 88 is provided vertically movably via a rod 122 provided on a motor 121.

The U-shaped portion 120 is provided with an opening on the side of the jig main body 81, and the distance between the holding pieces 123 provided on both sides of the U-shaped portion 120 can be adjusted manually or automatically. By adjusting the spacing between the holding pieces 123 to match the shaft mounting portion 41 of the work 2, rotation of the entire work 2 around the flow path axis is disabled, and the shaft mounting portion 41 is prevented from shifting or rotating. Workpiece 2 can be held with .

Next, the apparatus main body 1 shown in FIG. 1 will be explained. In the apparatus main body 1, a frame body 10 is formed into a frame shape into which a workpiece 2 can be mounted, and an inspection space R for performing a pressure resistance test of the workpiece 2 is provided inside the frame body 10. An opening 20 is provided in a part of the frame 10, and the work 2 is attached to and removed from the right side or the front side of the frame 10 in FIG. 1 through the opening 20. Inside the frame 10, in addition to the jig main body 81, a chamber 11, a gas sensor 12, and a clamp jig 14 are attached.

The chamber 11 includes a substantially rectangular cover part 23 that is large enough to accommodate the upper part of the shafting part 41, which is the part to be inspected of the workpiece 2, and a hanging part integrally provided on the upper surface side of the cover part 23. It has a part 24 and is provided so as to be movable forward/backward and upward/downward within the inspection space R via this hanging part 24. The chamber 11 is of a semi-open type with an open bottom, and the shaft mounting portion 41 of the workpiece 2 can be guided into the chamber from the bottom side. A test space S having a predetermined volume is provided in the chamber 11, and a pressure resistance test can be performed with the shaft mounting portion 41 surrounded by the test space S. A gas sensor 12 and an exhaust fan 26 are attached to the chamber 11 .

The gas sensors 12 are provided at a plurality of predetermined locations inside the chamber 11 , in this example, two locations on the inner surface of the chamber 11 and one location on the inner upper surface of the chamber 11 . Leakage of the search gas from the section 41 can be detected within the chamber 11. The number of gas sensors 12 can be set arbitrarily, and by increasing the number, the detection ability can be improved and the detection time can be shortened.

The gas sensor 12 is provided so as to be retractable laterally from the shaft mounting portion 41 as the chamber 11 moves. After the pressure resistance test, the residual gas in the test space R is discharged with the gas sensor 12 in the retracted state, and the next workpiece 2 can be tested quickly and accurately.

The gas sensor 12 in this embodiment is a hydrogen sensor, and is capable of detecting hydrogen gas, which will be described later, as a search gas supplied into the workpiece 2 . By using the hydrogen sensor 12, leakage of hydrogen in a gas mixture of hydrogen and nitrogen, which will be described later, which is a diffusible gas, can be reliably detected. The gas sensor 12 is fixed to the chamber 11, but may be movably attached to adjust its position.

The exhaust fan 26 is provided on the side of the space in the chamber 11 from which the search gas is evacuated from the gas sensor 12 . This exhaust fan 26 makes it possible to exhaust hydrogen gas remaining in the inspection space S in the chamber 11 to the outside. A constriction part 27 for constricting the flow path is provided between the exhaust fan 26 and the inspection space S, and when the exhaust fan 26 exhausts the air, the exhaust speed is increased through the constriction part 27 to remove the residue in the chamber 11. Gas is purged efficiently.

The clamp jig 14 includes a fixed clamp jig 30 and a movable clamp jig 31.
The fixed clamp jig 30 is placed through a fixing holder 32 at a position that is the primary side of the workpiece 2, and near the center of the fixed clamp jig 30 is a primary side for supplying search gas into the inside of the workpiece 2. A side channel 33 is formed. A sealing member 34 made of a ring-shaped gasket is attached to the surface of the fixed clamp jig 30 facing the primary side of the work 2, and this gasket 34 prevents leakage from the pressure contact part with the work 2 held by the jig body. Leakage is prevented.

On the other hand, the movable clamp jig 31 is disposed on the secondary side of the workpiece 2, and is attached to the fixed clamp jig 30 so as to be able to move forward and backward in the tightening direction so as to be able to hold the workpiece 2.
The moving direction of the chamber 11 described above and the moving direction of the movable clamp jig 31, which is a clamp jig for the workpiece 2, are arranged in the same direction. A secondary flow path 35 that is a purge flow path is provided inside the movable clamp member 31, and after the pressure resistance test of the workpiece 2, the search gas in the workpiece 2 is purged with air pressure through this purge flow path 35. , are discharged to the outside of the inspection space S and the inspection space R.

A seal member 34 made of a ring-shaped gasket is attached to the surface of the movable clamp jig 31 facing the secondary side of the workpiece 2, similarly to the fixed clamp jig 30. This gasket 34 prevents leakage from the pressure contact portion of the work 2 held by the jig body with the movable clamp jig 31.

For example, a gas containing hydrogen is used as the search gas supplied to the workpiece 2 during the valve seat inspection and the pressure resistance inspection. Hydrogen gas, which is a mixed gas containing 95% nitrogen, is used. This gas mixture has a property of leaking from the vicinity of the screwed part between the shaft mounting part 41 and the packing retainer 43 of the body 40 if there is external leakage during the pressure test.

The search gas, which is a mixture of 5% hydrogen and 95% nitrogen, is a nonflammable high-pressure gas, so it can be used safely. The search gas may be a gas other than hydrogen-containing gas, and for example, various gases such as helium gas and methane gas can be used. When helium gas is used as the search gas, a gas thermal conduction type sensor may be used as the gas sensor, and it has high diffusivity like a hydrogen-containing gas mixture.

FIG. 6 shows an example of an inspection line 50 equipped with the apparatus main body 1 when the workpiece 2 is a ball valve. In this inspection line 50, the jig main body is omitted, and the flow path from the hydrogen gas supply side to the primary side of the device main body 1 is shown as a first flow path 51, and the flow path after the secondary side of the device main body 1 is The passage is referred to as a second flow passage 52.
In addition to the apparatus body 1 described above, the inspection line 50 includes a hydrogen gas supply source 53, a regulator 54, a purge air supply source 55, solenoid valves 56, 57, 58, 59, a pressure gauge 60, and a pressure sensor 61. .

The hydrogen gas supply source 53 is provided to be able to supply hydrogen gas to the workpiece 2 from the first flow path 51 of the inspection line 50, and supplies hydrogen gas adjusted to about 0.2 MPa to the electromagnetic valve 56 via the regulator 54. be done. The solenoid valve 56 is provided so that hydrogen gas can be supplied into the workpiece 2 during a pressure resistance test by opening and closing the solenoid valve 56 . The purge air supply source 55 is provided to be able to supply purge air at a pressure of about 0.6 MPa to the workpiece 2 from the first flow path 51, and purge air is supplied into the workpiece 2 after the pressure resistance test is completed by opening and closing the solenoid valve 57. A vacuum passage 62 is provided between the solenoid valves 56 and 57 and the fixed clamp fitting 30, and hydrogen gas in the first passage 51 is discharged to the outside by opening and closing the solenoid valve 58 through the vacuum passage 62. possible.

The second flow path 52 is provided with an exhaust flow path 63, and this exhaust flow path 63 is provided so as to be openable and closable by a solenoid valve 59. A pressure gauge 60 and a pressure sensor 61 are provided in the exhaust flow path 63, and the pressure of hydrogen gas in the workpiece 2 can be measured via these. A vacuum flow path 64 is also provided in the second flow path 52, and purge air is supplied through an auxiliary flow path 67 connected to a purge air supply source 55 by opening a solenoid valve 68 provided in this auxiliary flow path 67. The hydrogen gas is supplied to the vacuum flow path 64 side, and is provided so that the hydrogen gas in the second flow path 52 can be discharged to the outside via the vacuum flow path 64. Discharge of hydrogen gas from the first flow path 51 and the second flow path 52 via the vacuum flow paths 62 and 64 can be performed from either one side or both sides by switching the electromagnetic valves.

The inspection line 60 is provided so as to be controllable by a control unit 65 consisting of a CPU (central processing unit), and the control unit 65 includes a gas sensor 12, each electromagnetic valve 56 to 59, a hydrogen gas supply source 53, and a purge air supply source 55. Each element is electrically connected. The control unit 65 stores a large number of workpiece-specific tables (installation data) that are set based on the nominal pressure, nominal diameter, valve type, etc. of the workpiece 2.

The control unit 65 is connected to an input unit 66 which is a one-dimensional code or two-dimensional code reading unit, and data specific to the workpiece 2 can be inputted via the input unit 66. The unique data of the workpiece 2 input through the input section 66 is compared with a table in the control section 65, and the corresponding table is selected. The input section 66 is not limited to a code reading section, but can be provided in various forms such as a keyboard.
In the jig main body 81, the taper angle θ of the support surface 100 and the amount of movement in the vertical and horizontal directions are controlled based on the table.

Although not shown, it is preferable that the control unit 65 is provided with a digital display unit. In this case, when hydrogen leaks from the workpiece 2, the hydrogen gas concentration is displayed via a signal processing unit provided in the control unit 65. It is output to this digital display section as a voltage corresponding to the voltage. The digital display unit has an LCD (liquid crystal display), and the output voltage of each gas sensor 12 is displayed as an indicator on the LCD.

In the jig main body of the above embodiment, the support part 83 on the side where the taper angle θ is not adjusted is provided to be movable vertically and movably horizontally; Alternatively, both may be provided to be vertically movable and horizontally movable.

The device main body 1 may have a structure other than the above-described structure as long as the workpiece 2 can be coaxially clamped and tested with the jig main body 81, and the structure of the frame 10, chamber 11, clamp jig 14, etc. You can set the mounting position etc. as appropriate.

In the above embodiment, the entire horizontal plate 112 is moved up and down by the motor 87, which also serves to raise and lower the support parts 82 and 83. This motor 87 is attached to the lower part of the motor 84 on the support member 110 side to support You may make it raise and lower only the part 82 side.

The workpiece 2 has a shape having a polygonal tightening joint 90 on one side, and the tightening joint 90 has a tapered portion in part, for example, so that the side facing the support surface 100 is in surface contact. A shape other than a polygon may be used as long as it can be supported in the same state.

Next, a voltage resistance test method when the jig main body 81 described above is connected to the test line 50 of FIG. 6 will be described. The pressure resistance test method in this embodiment is based on, for example, each pneumatic test of the valve box pressure resistance test specified in JIS B 2003 (General Rules for Inspection of Valve).

The steps of the pressure-resistant inspection method in this example include a preliminary pressure-resistant inspection that partially inspects the component parts of the workpiece 2, and a main pressure-resistant inspection that performs an overall inspection of the entire workpiece 2 and each seal part. Although these tests are performed one after the other, it is also possible to perform either one of these tests.

Before the pressure resistance preliminary inspection, the aforementioned body 40, stem 42, O-ring 45, and packing retainer 43, which are some of the constituent parts of the workpiece 2 consisting of a ball valve, are assembled in advance into a semi-finished state.

At the time of inspection, first, a two-dimensional code, which is unique data given to the workpiece 2, is read by the reading section 66, which is an input section, and is input to the control section 65. This input unique data is compared with a plurality of tables stored in advance in the control unit 65, and the corresponding table is selected.

4 and 5A, the rod 110 is moved up and down by the rotation of the motor 84 in accordance with the input data specific to the workpiece 2, and the pin member 104 is moved vertically in accordance with the movement of the rod 110. Moving. The movement of the pin member 104 pushes both support members 102 and 103 through the notch 107, and each support member 102 and 103 rotates equally at a predetermined angle around the fulcrum 105, tightening the workpiece 2. The taper angle θ of the support surface 100 is adjusted to 140° corresponding to the inclination angle β of the attached joint portion 90 of 140°.

At this time, in FIG. 1, the motor 85 rotates and the rod 111 expands and contracts by a predetermined amount in the vertical direction, and the motor 86 rotates and the rod 113 expands and contracts by a predetermined length in the horizontal direction, thereby supporting the other side. The support surface 101 of the section 83 is moved a predetermined distance in the vertical and horizontal directions.

By adjusting the taper angle θ of the support surface 100 and moving the support surface 101, the workpiece 2 can be coaxially held between the supporting parts 82 and 83.
These support parts 82 and 83 are automatically or manually supported in a predetermined direction while bringing the primary side of the semi-finished work 2 including the sealing part 46 into contact with the gasket 34 of the fixed clamp jig 30. 82 and 83.

Subsequently, in FIGS. 2 and 3, the motor 87 rotates in accordance with the input data, the rod 115 expands and contracts in the vertical direction by a predetermined amount, and the horizontal plate 112 moves by a predetermined amount in the vertical direction. The shaft mounting portion 41 moves to approximately the same horizontal position as the correction holder 88. In this state, the motor 12 rotates to extend the rod 122, and the U-shaped portion 120 provided at the distal end of the rod 122 moves to a position where the shaft mounting portion 41 is held between both sides, thereby holding the shaft mounting portion 41. At this time, the two holding pieces 123 of the U-shaped portion 120 are adjusted to an appropriate interval according to the outer diameter of the shaft mounting portion 41.
By holding the shaft mounting portion 41 with the U-shaped portion 120, the workpiece 2 is supported in an appropriate state by the jig main body 81, rotation of the workpiece 2 is prevented, and pressure resistance inspection can be performed from the positioned shaft mounting portion 41. .

Thereafter, the movable clamp jig 31 is moved from the secondary side of the work 2 in the holding direction to clamp the work 2 at a predetermined position. At this time, gaskets 34 and 34 are sealed at the primary and secondary ends of the work 2, respectively, to prevent leakage, and the fixed clamp jig 30 is attached to the primary and secondary opening sides of the work 2. The flow path 33 and the purge flow path 35 of the movable clamp jig 31 are communicated with each other.

When carrying out the pressure resistance preliminary inspection, all the gas sensors 12 in FIG. This state becomes a standby state before the start of the test, and the preliminary voltage test is started by inputting the test start signal.

Immediately thereafter, the chamber 11 is moved forward and lowered to cover the upper part of the shaft mounting part 41 with the chamber 11 in order to perform a pressure test of the shaft seal part 46 formed by the O-ring 45 of the workpiece 2 . At this time, the shaft mounting portion 41 is surrounded by the volume of the inspection space S of the chamber 11.
In this state, hydrogen gas as a search gas is supplied into the workpiece 2, and the workpiece 2 is sealed and pressurized to detect the presence or absence of hydrogen gas leakage in the inspection space S in the chamber 11. This makes it possible to detect defects and machining defects in the workpiece 2 at an early stage.

An example of the control by the CPU 65 of the voltage resistance preliminary test at this time will be shown below.
If the pressure value (pressure value inside the workpiece 2) measured by the pressure sensor 61 of the inspection line 50 in FIG. return. On the other hand, when the measured pressure value is equal to or higher than the specified pressure, the process proceeds to the next pressure drop detection step. At this time, the supply of hydrogen gas is stopped.

The pressure drop detection step continues for a specified detection time until the measured value of the pressure sensor 61 becomes 97% or less of the initial value, and when it becomes 97% or less, the pressure inside the workpiece 2 reaches a pressure value that is not suitable for inspection. It is assumed that the pressure has dropped, the end (NG) occurs, and the NG signal is output to return to the initial state. In this case, the workpiece 2 fails the preliminary pressure test. In this manner, the pressure drop detection step is continued unless the pressure falls below 97% of the initial value within the specified detection time.

In the pressure-resistant leakage detection step, it is determined whether the measured value by the gas sensor 12 is smaller than a threshold value for determining that a leak has occurred, and if it is smaller, the process proceeds to the next detection time measurement step. When the measured value of the gas sensor 12 exceeds the leakage threshold, it is assumed that a pressure-resistant leak has been detected from the workpiece 2, and the end (NG) is reached, an NG signal is output and the process returns to the initial state. In this case, the workpiece 2 fails the preliminary pressure test. As a result, in the withstand pressure leakage detection step, if the amount of leakage during the specified detection time is equal to or less than the standard, the test is passed.

The detection time measuring step measures whether or not a preset detection time has elapsed, and if the predetermined detection time has not been reached, feedback is fed back to the pressure drop detection step.
The steps from the pressure drop detection step to the detection time measurement step are repeatedly looped until the detection time of the detection time measurement step reaches a predetermined time. If no NG occurs in the pressure drop detection step and pressure leakage detection step until the predetermined time is reached, it means that the leakage of hydrogen gas under the predetermined pressure has remained below the standard value, and workpiece 2 has passed the pressure resistance preliminary inspection. Pass the exam.

After a predetermined period of time has elapsed, the chamber 11 is raised and retreated relative to the shaft mounting part 41, and purge air is supplied into the workpiece 2 while vacuuming is performed from the vacuum passage 62, thereby flushing the inside of the workpiece 2 in a sealed state. implement. Thereafter, the work 2 is removed from the apparatus main body 1 by unclamping to move the jig main body 81 in a direction away from the work 2.
Subsequently, when performing the next pressure resistance preliminary inspection of the workpiece 2, the same procedure as the above-mentioned inspection method may be used.

After the above pressure resistance preliminary inspection, all components to which pressure is applied, such as a valve body, ball seat, and cap (not shown), are assembled and integrated into the partially assembled workpiece 2. A handle is fixed to the upper part of the stem 42 via a washer and a nut (not shown), and a workpiece (valve) ready for use as a product is provided. This workpiece is held by a clamp jig in a large inspection space in a large inspection device (not shown), and the pressure-resistant main inspection is carried out with the entire workpiece covered in the large inspection space.

In this case, after turning the stem 42 through the handle to half-open the valve, a search gas consisting of hydrogen gas is sealed in the work including the valve cavity, and a gas sensor is used to check for leakage of the search gas. By detecting this, it is determined whether each workpiece passed or failed the main pressure resistance inspection. The jig main body 81 is also useful during this rotation of the handle, and supporting the workpiece 2 with the jig main body 81 makes it easier to rotate the handle.

A workpiece that has passed both the above-mentioned preliminary pressure test and this main test is a product that has passed the pressure test. If it is determined that the main pressure test has failed, the cause can be quickly identified by checking the parts excluding the seal parts that passed the preliminary pressure test. After the pressure resistance test, the inside of the workpiece is purged to remove residual gas, and then the clamp jig is loosened and the workpiece is removed.

Next, the operation of the above-described embodiments of the variable jig for an inspection device of the present invention, and the pressure resistance inspection device and pressure resistance inspection method for pressure equipment such as valves using the same will be described.
The jig main body 81 is constructed by adjusting the approximately V-shaped taper angle θ formed by the support surface 100 of the support member 102 on the support portion 82 side to 140°, which is the inclination angle β of the tightening joint portion 90 of the workpiece 2. By bringing this tightening joint 90 into close contact with the support surface 100, the workpiece 2 can be held in a state where it is prevented from tilting.

At this time, since the U-shaped portion 120 of the correction holder 88 holds the shaft mounting portion 41 of the work 2 in a non-rotatable manner, the orientation of the shaft mounting portion 41 is maintained while preventing the shaft mounting portion 41 from shifting. Even if a rotational force is applied to the workpiece 2 due to an external force or the like, the shaft mounting portion 41 is prevented from shifting and its vertical orientation is maintained. For this reason, errors are suppressed by accurately arranging the chamber 11 corresponding to the position of the shaft mounting portion 41 that differs for each workpiece 2, and inspecting the gas sensor 12 with the gas sensor 12 disposed at an appropriate position.

With respect to the support part 82, the support part 83 side is moved a predetermined amount vertically and horizontally by motors 85 and 86, and the support surface 100, By making it possible to set the mutual height and spacing between the workpieces 101, the workpiece 2 is supported by the supports 82 and 83 in a centered state while preventing the workpiece 2 from tilting, and while maintaining this state, the workpiece 2 is held by the clamp jig 14. Can be fixed from both ends. Thereby, the workpiece 2 can be fixed from three directions, that is, the X direction, the Y direction, and the Z direction, and a pressure resistance test can be performed while reliably preventing the occurrence of a gap between the gasket 34 of the clamp jig 14 and the end surface of the workpiece. Therefore, accurate voltage resistance test results can be obtained.

By providing the jig main body 81 in the apparatus main body 1, whether the work 2 is a finished product or a semi-finished product, it can be firmly held while corresponding to its shape and distance between surfaces, and automation is achieved. This allows continuous and rapid pressure testing.

By inputting unique data given to the work 2 from the input unit 66, control can be performed in advance according to the inclination angle β of the tightening joint 90 of the work 2, the difference in shape on both sides of the work 2, the distance between surfaces, etc. A unique table stored in the section 65 is selected, and the taper angle θ of the support surface 100 and the amount of vertical and horizontal movement of the support surface 100 are automatically set for each workpiece 2 based on this table. Even in the case of different workpieces 2, it is possible to automate the pressure resistance test in a short time.

In FIG. 7(a), another example of the usage state of the jig main body 81 is shown. In this case, in FIG. 7(b), the ball valve that is the workpiece 130 has a nominal diameter of 3/4 inch, and its tightening joint 131 is provided in a regular hexagonal shape. As a result, one internal angle α2 of the tightening joint 131 becomes 120°, and the inclination angle β of the tightening joint 131 at this time also becomes 120°.

In FIGS. 7(a) and 7(b), when the workpiece 130 is supported by the jig main body 81 described above, a two-dimensional code corresponding to the workpiece 130 is read by the input unit 66 and input to the control unit 65. Then, the taper angle θ of the support surface 100 of the support member 102 is automatically adjusted to a state of 120°, and the clamping joint 131 of the workpiece 130 is placed on this support surface 100 and held. It becomes possible to do so. At this time, since the distance between the surfaces is shorter than that of the workpiece (ball valve) 2 described above, the rod 113 is extended by the motor 86 and the support member 103 is moved toward the support member 102, so that the short distance between the surfaces is It becomes possible to respond.

FIG. 8(a) shows still another example of the usage state of the jig main body. In this case, in FIG. 8(b), the ball valve that is the workpiece 140 has a nominal diameter of 3/4 inch, and its tightening joint 141 is provided in a regular octagon with sides located at the upper and lower positions. . In this case, one interior angle α3 of the fastening joint 131 is 120°, but the inclination angle β of the fastening joint 141 is 90° due to the orientation of the regular octagon.

In FIGS. 8(a) and 8(b), when the workpiece 140 is supported by the jig main body 81, the two-dimensional code is read to rotate the support member 102 until the taper angle θ of the support surface 100 is 90°. The clamping joint 141 of the workpiece 140 can be held on this support surface 100 in a state where it is placed on the support surface 100. When the shaft mounting portion 41 of the jig main body is short as in this example, the correction holder 88 used in FIG. 7 can be omitted.

The jig main body 81 described above can be used for purposes other than inspection, for example, when assembling the work 2. In this case, as shown in FIG. 1, only the body 40 constituting the workpiece 2 is clamped by the jig main body 81, and the apparatus main body 1 is used as an assembly device to perform the assembly.

When assembling is performed using the apparatus main body 1, for example, the apparatus main body 1 is used as a device for inserting the stem 42, which is an operating shaft part, into the shaft mounting part 41 of the workpiece 2 held by the jig main body 81. It will be done. In this case, it becomes easy to automate the apparatus main body 1 to the shaft mounting portion 41 of the work 2 held in a predetermined position by the jig main body 81, and this automation makes it possible to reliably and accurately assemble the stem 42.
When the device main body 1 is used as an assembly device, it can also be used for an assembly process other than the assembly process in which the operating shaft section is inserted into the shaft mounting section.

Further, the jig main body 81 shown in FIG. 1 can also be used when processing the workpiece 2. In this case, in FIG. 1, only the body 40 is clamped by the jig main body 81, and the processing is performed using the apparatus main body 1 as a processing device.

When machining is performed using the apparatus main body 1, for example, the apparatus main body 1 is used as a device for forming a female screw 95 for screwing the packing retainer 43 on the inner circumference of the shaft mounting portion 41 of the workpiece 2. In this case, as in the case of the above-mentioned assembly, automation of the device main body 1 is facilitated, and this automation allows the female screw portion 95 to be formed in a reliable and accurate position.
When the device main body 1 is used as a processing device, it can also be used for processing steps other than the processing step of forming the female screw 95 on the inner periphery of the shaft mounting portion 41.
As described above, the jig main body 81 can also be used for devices that perform assembly and processing, which are purposes other than inspection, and can also be used for various devices other than these.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and the present invention is not limited to the scope of the invention described in the claims of the present invention. It is possible to make various changes. For example, the variable jig for inspection equipment of the present invention can be applied to various pressure devices such as pneumatic actuators, including valves other than ball valves such as globe valves and gate valves, and piping devices other than valves. can. Furthermore, it can be applied to various devices and instruments other than pressure equipment, and on the other hand, it is also possible to use the inspection device for various inspections other than pressure resistance inspections.

1 Equipment body 2 Ball valve (work)
41 Shaft part (protruding part)
66 input section 82, 83 support section 84, 85, 86, 87, 121 motor 88 correction holder 90 tightening joint section 100, 101 support surface 102, 103 support member 104 pin member 105 shaft member (fulcrum)
120 U-shaped part θ Taper angle β Inclination angle

Claims (7)

This is a pressure resistance testing device for pressure equipment that uses a variable jig for an inspection device to test a workpiece consisting of a pressure device such as a valve. , support parts each having a support surface are provided on both sides of the jig main body, and the support part on one side is arranged between a pair of plate-shaped support members pivotally supported at a fulcrum and these support members. The pin member is provided to be movable in the vertical direction via a motor, and the vertical movement of the pin member causes an angular change due to rotation of both support members about the fulcrum. The substantially V-shaped taper angle formed by the supporting surfaces is adjustable in accordance with a predetermined inclination angle of a rectangular fastening joint formed on the workpiece, and the mutual relationship between the supporting surfaces is adjusted. The height and spacing of the support surface can be set according to the difference in shape of both sides of the workpiece and the distance between the surfaces, and the height and the interval between the support surfaces 1. A pressure resistance inspection device for pressure equipment using a variable jig for an inspection device, characterized in that the taper angle of the jig is adjusted so that the pressure resistance test can be performed while the workpiece is held coaxially with the jig main body. 2. The variable inspection apparatus according to claim 1, wherein the remaining one side of the support part is integrally formed in a substantially Y shape, and the support part is provided to be vertically movable via a motor different from the motor. Pressure testing device for pressure equipment using a jig. A pressure-resistant inspection device for pressure equipment using a variable jig for inspection device according to claim 1 or 2, wherein either one side of the support portion is provided so as to be horizontally movable via a motor. A correction holder having a U-shaped portion on the front side is provided, and the correction holder is provided to be movable in vertical and horizontal directions via a motor, and the interval between the U-shaped portions is adjustable. A pressure resistance test of a pressure equipment using the variable jig for an inspection device according to any one of claims 1 to 3, wherein the workpiece is held non-rotatably across a protrusion formed in the centrifugal direction of the workpiece. Device. Unique data given to the workpiece consisting of a pressure device such as a valve is input from the input section, and the taper angle of the support surface is adjusted in accordance with the inclination angle of the tightening joint of the workpiece according to the input data. Claim 1, wherein the workpiece is held coaxially with the jig main body by adjusting and moving the support surface on at least one side in the vertical and horizontal directions, and the pressure resistance test is performed in this state. 5. A pressure resistance testing method for pressure equipment using the variable jig for testing equipment according to any one of items 4 to 4. A jig main body is provided to support a workpiece to be assembled by various assembly devices, and a support part having a support surface is provided on both sides of the jig main body, and the support part on one side is pivoted at a fulcrum. It has a pair of plate-shaped support members and a pin member disposed between these support members, and the pin member is provided to be movable in the vertical direction via a motor, and the vertical movement of the pin member is caused by the vertical movement of the pin member. The approximately V-shaped taper angle formed by the support surfaces is converted into an angular change due to rotation of both support members about the fulcrum, and the predetermined inclination angle of the rectangular tightening joint formed on the workpiece. The assembling device is provided so as to be adjustable according to the support surfaces, and the mutual height and spacing between the support surfaces can be set depending on the difference in shape on both sides of the workpiece and the distance between the surfaces. A variable jig for an assembly device, characterized in that it is a device for inserting an operating shaft into a shaft fitting formed on a workpiece . A jig main body is provided to support a workpiece to be processed by various processing devices, and a support part having a support surface is provided on both sides of the jig main body, and the support part on one side is pivoted at a fulcrum. a pair of plate-shaped support members, and a pin member disposed between these support members; The approximately V-shaped taper angle formed by the support surface is converted into an angular change due to rotation of both support members about the fulcrum, and the predetermined inclination of the rectangular fastening joint formed on the workpiece. The processing device is provided so as to be adjustable according to the angle, and the mutual height and spacing between the support surfaces can be set depending on the difference in shape on both sides of the workpiece and the distance between the surfaces , and the processing device includes: A variable jig for a processing device, characterized in that it is a device for forming a female thread on the inner periphery of a shafting portion formed on the workpiece .

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