Mounting jig for gland packing, and mounting method

Abstract

A mounting jig 10 comprises a cylindrical member 11. The cylindrical member 11 has an inner circumferential surface 11i that is circular in cross section and that has a diameter which is larger than the outer diameter of a shaft A but not more than that inner diameter of a stuffing box B which accommodates gland packing 1a, 1b. The cylindrical member 11 is attached to the shaft A so as to surround the shaft A. Formed in the cylindrical member 11 is an introduction slit 12 which guides a tape member 1 from the outside of the cylindrical member 11 to the inside of the cylindrical member 11. The cylindrical member 11 can be attached from a side of the shaft A.

Description

Mounting jig and mounting method for gland packing

[0001] The present invention relates to a mounting jig and a mounting method for gland packing.

[0002] Conventionally, in devices that control fluids such as valves and pumps, gland packing has been used to suppress fluid leakage from around a rotating or reciprocating shaft (see, for example, Patent Document 1 below). For gland packing, for example, annular packing formed by shaping expanded graphite or the like into a string shape and winding it around the shaft in a ring shape is often used. The gland packing is housed in plurality in a stuffing box in a state of being mounted (externally fitted) on the shaft, and is compressed and deformed by being axially pressed by a packing retainer. The plurality of gland packings are axially compressed so that the inner peripheral surface is pressed against the outer peripheral surface of the shaft and the outer peripheral surface is pressed against the inner peripheral surface of the stuffing box, thereby sealing so that fluid does not leak from one side to the other side of the gland packing.

[0003] By the way, when using annular packing as gland packing, although the end faces of the string-like objects are made to abut when forming into a ring shape, there may be a case where a gap is formed, and this gap may cause a decrease in sealing performance.

[0004] Therefore, instead of annular packing, a tape member formed by shaping expanded graphite or the like into a belt shape and wound around the shaft in multiple layers may be used as gland packing. According to such gland packing, since the tape member is wound in multiple layers, no gap such as that in annular packing is formed, and the sealing performance is excellent.

[0005] Japanese Unexamined Patent Application Publication No. 2022 - 162427

[0006] However, gland packing is a consumable item that deteriorates with use and needs to be replaced. The problem is that various components (such as handles and handle yokes in valves) are located around the shaft of the stuffing box where the gland packing is installed. Therefore, while it is easy to wrap a short string around the shaft once, it is difficult to wrap a long tape-like material around the shaft multiple times while avoiding interference with surrounding components. Thus, the manufacturing (formation and installation) of gland packing has been a time-consuming process.

[0007] The present invention has been made in view of the above, and its purpose is to enable the easy manufacture (formation and installation) of gland packing, which is constructed by winding a tape member around a shaft.

[0008] To achieve the above objectives, the present invention uses a cylindrical member that can be attached to the side of a shaft, having an inner surface with a circular cross-section and an introduction slit formed therein to guide the tape member from the outside to the inside. By simply pushing the tape member into the introduction slit of the cylindrical member attached to the shaft, the tape member is wound around the shaft to form a gland packing and is attached to the shaft.

[0009] Specifically, the first invention is based on a mounting jig for attaching a gland packing, which is formed by winding a tape member, to a shaft.

[0010] The first invention is characterized in that it comprises a cylindrical member attached to the shaft so as to surround the shaft, having an inner surface with a circular cross-section and a diameter larger than the outer diameter of the shaft and less than or equal to the inner diameter of the stuffing box in which the gland packing is housed, wherein the cylindrical member has an introduction slit formed therein to guide the tape member from the outside of the cylindrical member to the inside of the cylindrical member, and the cylindrical member is configured to be attachable from the side of the shaft.

[0011] According to the mounting jig of the first invention, after attaching the cylindrical member to the shaft so as to surround the shaft from the side of the shaft, the tape member is fed from the outside to the inside of the cylindrical member through the introduction slit, and the tape member is wound around the shaft inside the cylindrical member. Specifically, the tape member is first fed out in the circumferential direction along the inner surface of the cylindrical member inside the cylindrical member. As the tape member is fed one after another into the introduction slit, the tape member is fed out one after another from the introduction slit and advances in the circumferential direction along the inner surface inside the cylindrical member, so that the tape member is wound around the outer circumference of the shaft in a spiral from the outside to the inside, forming a gland packing and attaching it to the shaft. Thus, according to the mounting jig of the first invention, without removing various parts around the shaft, by using a cylindrical member that can be attached from the side of the shaft, a gland packing can be easily formed on the outer circumference of the shaft simply by feeding the tape member into the introduction slit, and since the gland packing is attached to the shaft at the same time as it is formed, the gland packing can be easily attached to the shaft. In other words, by using the mounting jig according to the first invention, gland packing can be easily manufactured (formed and mounted) on the outer circumference of the shaft.

[0012] The second invention is characterized in that, in the first invention, the cylindrical member is composed of a plurality of separable members connected in the circumferential direction on the outer circumference of the shaft.

[0013] According to the mounting jig of the second invention, a cylindrical member that can be attached to surround the shaft from the side can be realized with a simple structure.

[0014] The third invention is characterized in that, in the first or second invention, the inner circumferential surface of the cylindrical member has a smaller diameter than the inner diameter of the stuffing box, the cylindrical member has a first portion with an outer shape that cannot be accommodated in the stuffing box, and a second cylindrical portion that is continuous with the first portion and can be fitted into the stuffing box, and the introduction slit is formed in the first portion.

[0015] In the mounting jig according to the third invention, the cylindrical member is composed of a first part and a second part having different external shapes. The first part is formed with an external shape that cannot be accommodated inside the stuffing box, and the second part is formed in a cylindrical shape that can be fitted inside the stuffing box. In other words, the cylindrical member is formed with an external shape having a step between the first part and the second part. When the cylindrical second part is fitted into the stuffing box, the cylindrical member is positioned in an appropriate location for winding the tape member, whose central axis of the inner circumferential surface coincides with the axis of the shaft, around the shaft. Furthermore, because the stepped portion of the cylindrical member abuts the axial end face of the stuffing box, the first part is not accommodated inside the stuffing box and is positioned outside the stuffing box. After positioning the cylindrical member in this location, the tape member can be fed into the interior of the cylindrical member through an introduction slit formed in the first part, thereby winding the tape member around the outer circumference of the shaft near the stuffing box, and forming and attaching the gland packing near the stuffing box. Therefore, the formed gland packing can be installed in a predetermined position within the stuffing box simply by sliding it slightly axially along the shaft. Accordingly, the mounting jig according to the third invention not only allows for easy manufacturing (formation and mounting) of the gland packing onto the shaft, but also allows for easy installation in a predetermined position within the stuffing box.

[0016] The fourth invention is characterized in that, in any one of the first to third inventions, a recess or a protrusion is formed on the inner circumferential surface of the cylindrical member so as to reduce the contact area between the tape member, which is fed into the inside of the cylindrical member from the introduction slit, and the cylindrical member.

[0017] In the mounting jig according to the fourth invention, as described above, the tape member is fed from the outside to the inside of the cylindrical member through an introduction slit, thereby winding the tape member around the shaft inside the cylindrical member. In this configuration, as the number of turns increases, the frictional force generated between the tape member and the inner surface of the cylindrical member increases, making it difficult to feed the tape member. Therefore, in the mounting jig according to the fourth invention, recesses or protrusions are formed on the inner surface of the cylindrical member to reduce the contact area between the tape member fed into the inside of the cylindrical member through the introduction slit and the cylindrical member. By forming recesses or protrusions on the inner surface of the cylindrical member in this way and reducing the contact area between the tape member and the cylindrical member, the frictional force generated between the tape member and the cylindrical member is reduced. Consequently, with the mounting jig according to the fourth invention, the tape member can be smoothly fed into the inside of the cylindrical member, making it easy to form a gland packing and mount it on the shaft.

[0018] The fifth invention is a mounting method for mounting a gland packing, which is formed by winding a tape member, onto a shaft using a mounting jig according to any one of the first to fourth inventions, characterized in that it comprises a mounting step of attaching the cylindrical member to the shaft from the side, and a winding step of feeding the tape member into the introduction slit of the cylindrical member attached to the shaft, thereby winding the tape member around the outer circumference of the shaft inside the cylindrical member to form the gland packing and mounting it onto the shaft.

[0019] According to the mounting method of the fifth invention, the cylindrical member of the mounting jig is attached to the shaft so as to surround the shaft from the side of the shaft, and the tape member is fed into the interior of the cylindrical member through the introduction slit, so that the tape member is wound around the shaft inside the cylindrical member. In this way, with the above mounting method, without removing various parts around the shaft, by using a cylindrical member that can be attached so as to surround the shaft from the side of the shaft, the gland packing can be easily formed on the outer circumference of the shaft simply by feeding the tape member into the introduction slit, and since the gland packing is attached to the shaft at the same time as it is formed, the gland packing can be easily attached to the shaft. In other words, according to the mounting method of the fifth invention, the gland packing can be easily manufactured (formed and attached) on the outer circumference of the shaft.

[0020] As described above, according to the present invention, a cylindrical member is used that has a circular inner surface in cross-section and an introduction slit formed therein to guide the tape member from the outside to the inside, and can be attached from the side of the shaft. By simply pushing the tape member into the introduction slit of the cylindrical member attached to the shaft, the tape member is wound around the shaft to form a gland packing and is attached to the shaft. Thus, a gland packing formed by winding a tape member around a shaft can be easily manufactured (formed and attached).

[0021] Figure 1 is a schematic diagram of the area near the shaft seal of a fluid device using gland packing. Figure 2 is a perspective view of the mounting jig from above. Figure 3 is an exploded perspective view of the mounting jig from above. Figure 4 is a flow chart showing the flow of the gland packing mounting method. Figure 5 is an explanatory diagram showing how the mounting jig is attached to the shaft in the mounting process. Figure 6 is an explanatory diagram showing how the tape member is fed into the cylindrical member in the first and second winding processes. Figure 7 is a cross-sectional view showing the area near the shaft seal of the fluid device during the first winding process. Figure 8 is a cross-sectional view showing the area near the shaft seal of the fluid device after the first winding process. Figure 9 is a cross-sectional view showing the area near the shaft seal of the fluid device after the first sliding process and during the second winding process. Figure 10 is a cross-sectional view showing the area near the shaft seal of the fluid device after the second winding process. Figure 11 is a cross-sectional view showing the area near the shaft seal of the fluid device after the second sliding process. Figure 12 is a cross-sectional view showing the area near the shaft seal of the fluid device. Figure 13 is a perspective view of the mounting jig of Embodiment 2, viewed from above. Figure 14 is a plan view of the mounting jig of Embodiment 2. Figure 15 is a perspective view of the mounting jig of Embodiment 3, viewed from above. Figure 16 is a plan view of the mounting jig of Embodiment 3.

[0022] Embodiments of the present invention will be described in detail below with reference to the drawings. The following description of embodiments is essentially illustrative and is not intended to limit the present invention, its applications, or its uses in any way.

[0023] <Embodiment 1 of the Invention> - Usage of Gland Packing - As shown in Figure 1, the gland packings 1a and 1b, which are mounted on the shaft A by the mounting jig 10 according to the present invention, are provided in the shaft seal P of various fluid equipment such as rotary pumps, reciprocating pumps, valves, and agitators. In Embodiment 1, an example in which the fluid equipment is a valve will be described. In the following description, the extension direction of the shaft A and the direction parallel to the extension direction of the shaft A will be referred to as the "axial direction".

[0024] As shown in Figure 1, the valve comprises a shaft A, a cylindrical stuffing box B surrounding the shaft A, a packing retainer C, a handle D, and a handle yoke E. A valve (not shown) is attached to one end of the shaft A, and a handle D is attached to the other end. The handle D is rotatably supported together with the shaft A by two handle yokes E formed integrally with the stuffing box B. An annular space S is formed between the outer circumferential surface of the shaft A and the inner circumferential surface of the stuffing box B. The shaft seal P is provided in this annular space S and seals to prevent the fluid controlled by the valve from leaking from around the shaft A into the atmosphere.

[0025] In Embodiment 1, the shaft seal P is composed of first and second gland packings 1a, 1b, first and second adapter packings 2a, 2b, and first and second laminates 3a, 3b. As shown in Figure 1, the annular space S is housed in the order of first adapter packing 2a, first laminate 3a, first gland packing 1a, second gland packing 1b, second laminate 3b, and second adapter packing 2b, from the valve side in the axial direction to the atmospheric side. The shaft seal P, composed of these components 1a, 1b, 2a, 2b, 3a, 3b, is housed in the annular space S in a compressed and deformed state (crushed state) by being pressed against the valve-side wall of the annular space S by the packing retainer C.

[0026] The shaft seal P is compressed and deformed in the axial direction, causing it to make surface contact with the outer surface of the shaft A and the inner surface of the stuffing box B. As a result, even if the shaft A rotates or reciprocates while rotation or axial reciprocating motion is permitted, the outflow of fluid to the outside of the fluid equipment is suppressed. The packing retainer C is fastened to the stuffing box B with bolts F. By adjusting the tightness of this packing retainer C, the frictional resistance (frictional force) between the inner surface of the shaft seal P and the outer surface of the shaft A is adjusted.

[0027] The first and second gland packings 1a and 1b are made by winding a tape member 1 made of expanded graphite multiple times (for example, 10 to 20 times). The number of windings (turns) is changed according to the thickness of the tape member 1 and the radial length of the annular space S. The material of the tape member 1 is not limited to expanded graphite, but can be any material suitable for constituting a gland packing.

[0028] The first and second adapter packings 2a and 2b are incorporated into the shaft seal P to improve the sealing performance of the shaft seal P so that fluid leakage is suppressed by the shaft seal P even under high-pressure conditions. For this reason, the first and second adapter packings 2a and 2b are provided so as to sandwich the first and second gland packings 1a and 1b in the axial direction. The first and second adapter packings 2a and 2b are similarly constructed and are formed, for example, by braiding expanded graphite braided yarn reinforced with nickel alloy thread into a string shape and wrapping it once around the shaft A to form an annular shape. However, the first and second adapter packings 2a and 2b are not limited to the above configuration and may have any configuration as long as they achieve the above objective.

[0029] The first and second laminates 3a and 3b are made by punching an expanded graphite sheet into an annular shape. The first and second laminates 3a and 3b are formed in a shape that is approximately equal to the cross-sectional shape of the annular space S. The first and second laminates 3a and 3b are provided between the first and second gland packings 1a and 1b and the first and second adapter packings 2a and 2b, respectively, in order to improve the sealing performance and wear resistance of the first and second gland packings 1a and 1b.

[0030] Of the shaft seal portion P, the first and second adapter packings 2a, 2b and the first and second laminates 3a, 3b are formed in an annular shape, but they are not attached to the shaft A by inserting the shaft A through the inside, but rather attached to the shaft A from the side.

[0031] Specifically, the first and second adapter packings 2a and 2b are attached to the shaft A from the side by braiding them into a string shape and wrapping them once around the shaft A. The first and second laminates 3a and 3b have radially extending slits, and the two parts separated by the slits are separated, allowing the shaft A to pass through the gap and be attached to the shaft A from the side.

[0032] Of the shaft seal portion P, the first and second gland packings 1a and 1b are mounted on the shaft A from the side using a mounting jig 10. The configuration of the mounting jig 10 and the method of mounting the first and second gland packings 1a and 1b using the mounting jig 10 will be described in detail below.

[0033] -Gland Packing Mounting Jig- As shown in Figures 2, 3, 5 to 11, the mounting jig 10 comprises a cylindrical member 11 and wraps the tape member 1 multiple times around the outer circumference of the shaft A to form the first and second gland packings 1a and 1b, while simultaneously mounting it to the shaft A. For the sake of explanation below, as shown in Figure 2, the upper side in the axial direction of the shaft A to which the mounting jig 10 (cylindrical member 11) is attached will be referred to as the upper side, and the lower side as the lower side. A predetermined horizontal direction perpendicular to the axial direction will be referred to as the front-rear direction, with one side of the front-rear direction being the front side and the other side being the rear side. Furthermore, a horizontal direction perpendicular to the front-rear direction will be referred to as the left-right direction, with the left side being the left side and the right side being the right side when facing the front in the front-rear direction.

[0034] [Cylindrical Member] As shown in Figures 2, 3, 5 to 11, the cylindrical member 11 has an inner circumferential surface 11i with a circular cross-section. The inner circumferential surface 11i has a diameter d that is larger than the outer diameter d1 of the shaft A and less than or equal to the inner diameter d2 of the stuffing box B (see Figure 7). Because the inner circumferential surface 11i has such a diameter d, by winding the tape member 1 around the shaft A inside the cylindrical member 11, a gland packing (in this embodiment 1, the first and second gland packings 1a and 1b) of a size that can be accommodated in the stuffing box B can be formed. In this embodiment 1, the inner circumferential surface 11i of the cylindrical member 11 is formed to have a smaller diameter (d < d2) than the inner diameter d2 of the stuffing box b.

[0035] The cylindrical member 11 has an introduction slit 12 that guides the tape member 1 from the outside to the inside of the cylindrical member 11. The introduction slit 12 is a passage that connects the inside (the part surrounded by the inner circumferential surface 11i) of the cylindrical member 11 to the outside, and extends in the tangential direction of the inner circumferential surface 11i. The introduction slit 12 is formed with a cross-sectional shape and dimensions that allow the tape member 1 to be inserted. In this embodiment 1, the introduction slit 12 is formed by an elongated hole with a rectangular cross-section that has a width greater than the thickness of the tape member 1 (for example, 0.2 mm or more and 0.5 mm or less) and a height greater than the width of the tape member 1 (for example, 6 mm or more and 15 mm or less).

[0036] The cylindrical member 11 has a main body portion (first portion) 13 and an inner fitting portion (second portion) 14. The main body portion 13 and the inner fitting portion 14 are formed to be continuous in the axial direction. The inner circumferential surface of the main body portion 13 and the inner circumferential surface of the inner fitting portion 14 form an inner circumferential surface 11i that is continuous and flush with the surface in the axial direction without any steps.

[0037] The main body portion 13 is formed with an external shape that cannot be accommodated inside the stuffing box B. Specifically, in Embodiment 1, the main body portion 13 is formed in a shape obtained by cutting the front and rear ends of a thick cylindrical member with a vertical plane extending in the left-right direction. The maximum dimensions of the main body portion 13 in the front-rear and left-right directions (maximum length in the front-rear direction and maximum length in the left-right direction) are both formed to be longer than the inner diameter d2 of the stuffing box B.

[0038] On the other hand, the inner fitting portion 14 is formed to have an outer shape that can be fitted into the stuffing box B. Specifically, in Embodiment 1, the inner fitting portion 14 is made up of a thin-walled cylindrical member having an outer diameter such that its outer circumferential surface abuts against the inner circumferential surface of the stuffing box B.

[0039] The cylindrical member 11 has the main body portion 13 and the inner fitting portion 14 described above, and is configured to be divisible into two parts. Specifically, the cylindrical member 11 is composed of a first member 11a and a second member 11b that can be connected in the circumferential direction. Both the first member 11a and the second member 11b have half the circumference of the main body portion 13 and the inner fitting portion 14. The introduction slit 12 is formed in the first member 11a.

[0040] In this embodiment 1, a groove 11c is formed on the contact surface of the second member 11b with the first member 11a, and a projection 11d that can be fitted into the groove 11c is integrally formed or fixed from the contact surface of the first member 11a with the second member 11b. The first and second members 11a and 11b are connected in the circumferential direction and formed into a cylindrical shape by fitting the projection of the first member 11a into the groove 11c of the second member 11b.

[0041] -Method of attaching (manufacturing method) of gland packing- Next, the method of attaching the gland packing (first and second gland packings 1a, 1b) to the shaft A will be described. In this embodiment 1, the gland packings 1a, 1b are formed and attached to the shaft A by winding the tape member 1 around the shaft A. Therefore, the method of attaching the gland packing refers to the method of forming and attaching the gland packings 1a, 1b on the outer circumference of the shaft A (i.e., the method of manufacturing the gland packing).

[0042] In this embodiment 1, a mounting method for forming and mounting the first and second gland packings 1a and 1b on the shaft A using a mounting jig 10 will be explained with reference to Figures 4 to 12. As shown in Figure 7, before mounting the first and second gland packings 1a and 1b on the shaft A, the packing retainer C is removed from the stuffing box B, and the first adapter packing 2a and the first laminate 3a are mounted on the shaft A and pushed into the annular space S.

[0043] As shown in Figure 4, the method for installing the gland packing includes an installation step S1 in which the installation jig 10 is attached to the shaft A so as to surround the shaft A from the side; a first winding step S2 in which the tape member 1 is wound inside the cylindrical member 11 of the installation jig 10 to form a first gland packing 1a; a first sliding step S3 in which the first gland packing 1a is moved from inside the cylindrical member 11 into the stuffing box B; a second winding step S4 in which the tape member 1 is wound inside the cylindrical member 11 of the installation jig 10 to form a second gland packing 1b; a second sliding step S5 in which the second gland packing 1b is moved from inside the cylindrical member 11 into the stuffing box B; and a removal step S6 in which the installation jig 10 is removed from the shaft A.

[0044] (Mounting Step S1) As shown in FIG. 5, in the mounting step S1, on the outer periphery of the shaft A, the cylindrical member 11 is attached to the shaft A by connecting the first member 11a and the second member 11b of the cylindrical member 11. Specifically, the first member 11a and the second member 11b are opposed to each other with the shaft A interposed therebetween, and are brought closer to the shaft A from the side of the shaft A. Then, a protrusion protruding from the contact surface of the first member 11a with the second member 11b is fitted into the groove 11c formed on the contact surface of the second member 11b with the first member 11a, thereby connecting the first member 11a and the second member 11b. As a result, the cylindrical member 11 of the mounting jig 10 is attached to the shaft A so as to surround the shaft A, and an annular space for winding the tape member 1 is formed between the inner peripheral surface 11i of the cylindrical member 11 and the outer peripheral surface of the shaft A.

[0045] Thus, the cylindrical member 11 of the mounting jig 10 has a split structure instead of removing the components around the shaft A and inserting them from the end of the shaft A, and the first member 11a and the second member 11b are connected on the outer periphery of the shaft A, so that it can be attached to the shaft A from the side of the shaft A.

[0046] As shown in FIG. 7, above the annular space S where the first and second ground packings 1a and 1b are provided, after the cylindrical member 11 is attached to the shaft A, the cylindrical member 11 is slid downward so that the cylindrical inner fitting portion 14 of the cylindrical member 11 is fitted into the stuffing box B. As a result, the cylindrical member 11 is disposed at an appropriate installation position for winding the tape member 1 around the shaft A with the central axis of the inner peripheral surface 11i coinciding with the axis of the shaft A. Note that the stepped portion formed between the main body portion 13 and the inner fitting portion 14 of the cylindrical member 11 abuts on the axial end surface (upper end surface) of the stuffing box B, so that the main body portion 13 is not housed in the stuffing box B but is disposed outside the stuffing box B.

[0047] As described above, after the cylindrical member 11 of the mounting jig 10 is attached to the shaft A, as shown in FIG. 7, it is slid downward and the inner fitting portion 14 is fitted into the stuffing box B, so that the central axis of the inner peripheral surface 11i coincides with the axis of the shaft A and the internal space is disposed at an installation position continuous with the annular space S.

[0048] (First winding process S2) In the first winding process S2, as shown in FIGS. 6 and 7, the tape member 1 is fed into the inside of the cylindrical member 11 through the introduction slit 12 of the cylindrical member 11. Thereby, the tape member 1 is wound around the shaft A inside the cylindrical member 11. Specifically, the tape member 1 passes through the introduction slit 12 extending in the tangential direction of the inner peripheral surface 11i of the cylindrical member 11, and first, inside the cylindrical member 11, it is fed out in the circumferential direction along the inner peripheral surface 11i of the cylindrical member 11. When the tape member 1 is successively fed into the introduction slit 12, inside the cylindrical member 11, the tape member 1 is successively fed out from the introduction slit 12 and advances in the circumferential direction along the inner peripheral surface 11i, so that the tape member 1 is wound around the outer periphery of the shaft A so as to draw a helix from the outside to the inside. When the tape member 1 is wound around the shaft A a predetermined number of times (for example, 10 to 20 turns), the feeding of the tape member 1 is terminated and the tape member 1 is cut. Thereby, as shown in FIG. 8, the first grand packing 1a is formed on the outer periphery of the shaft A and is attached to the shaft A.

[0049] (First sliding process S3) In the first sliding process S3, the first grand packing 1a formed inside the cylindrical member 11 and attached to the shaft A is slid downward (toward the annular space S side) in the axial direction along the outer peripheral surface of the shaft A. The sliding movement may be performed by the operator's hand, or an annular member that fits inside the cylindrical member 11 may be attached above the first grand packing 1a of the shaft A, and the annular member may be slid downward along the shaft A. When using the annular member, when the annular member is slid downward, the lower surface of the annular member abuts against the upper end of the first grand packing 1a, and the first grand packing 1a is slid downward. In this way, the first grand packing 1a is slid downward in the axial direction along the outer peripheral surface of the shaft A and is pushed into the annular space S as shown in FIG. 9.

[0050] (Second winding process S4) Next, as shown in Figures 6 and 9, the second winding process S4 is performed. In the second winding process S4, similar to the first winding process S2, the tape member 1 is fed into the interior of the cylindrical member 11 through the introduction slit 12 of the cylindrical member 11. As a result, the tape member 1 is wound around the shaft A inside the cylindrical member 11. Specifically, the tape member 1 passes through the introduction slit 12 which extends tangentially to the inner circumferential surface 11i of the cylindrical member 11, and is first fed out circumferentially along the inner circumferential surface 11i of the cylindrical member 11. As the tape member 1 is fed into the introduction slit 12 one after another, the tape member 1 is fed out one after another from the introduction slit 12 inside the cylindrical member 11 and moves circumferentially along the inner circumferential surface 11i, so that the tape member 1 is wound around the outer circumference of the shaft A in a spiral from the outside to the inside. When the tape member 1 has been wound onto the shaft A a predetermined number of times (for example, 10 to 20 times), the feeding of the tape member 1 is stopped and the tape member 1 is cut. As a result, as shown in Figure 10, the second gland packing 1b is formed on the outer circumference of the shaft A and is attached to the shaft A.

[0051] (Second sliding step S5) In the second sliding step S5, similar to the first sliding step S3, the second gland packing 1b, which is formed inside the cylindrical member 11 and mounted on the shaft A, is slid downward in the axial direction (towards the annular space S) along the outer circumferential surface of the shaft A. The sliding movement may be performed by the operator's hand, or it may be performed by attaching an annular member that fits inside the cylindrical member 11 above the second gland packing 1b on the shaft A, and sliding the annular member downward along the shaft A. When using an annular member, when the annular member is slid downward, the lower surface of the annular member comes into contact with the upper end of the second gland packing 1b, causing the second gland packing 1b to slide downward. In this way, the second gland packing 1b is slid downward in the axial direction along the outer circumferential surface of the shaft A and pushed into the annular space S, as shown in Figure 11.

[0052] (Removal process S6) After mounting the first and second gland packings 1a and 1b to the shaft A as described above, a removal process S6 is performed to remove the mounting jig 10 from the shaft A. The removal process S6 is performed in the reverse order of the mounting process S1. Specifically, the cylindrical member 11 is removed from the shaft A by releasing the connection between the first member 11a and the second member 11b of the cylindrical member 11. Specifically, the first and second members 11a and 11b are pulled in opposite directions in the horizontal direction relative to each other. As a result, the projection of the second member 11b is pulled out of the groove 11c of the first member 11a, releasing the connection and removing the cylindrical member 11 from the shaft A.

[0053] Through the above process, the first and second gland packings 1a and 1b are mounted on shaft A and placed in the annular space S.

[0054] After the first and second gland packings 1a and 1b are installed in the annular space S, as shown in Figure 12, the second laminate 3b and the second adapter packing 2b are attached to the shaft A and pushed into the annular space S, and the packing retainer C is attached to the stuffing box B. By tightening the bolt F, the shaft seal portion P, which is composed of the first adapter packing 2a, the first laminate 3a, the first gland packing 1a, the second gland packing 1b, the second laminate 3b, and the second adapter packing 2b, is pressed against the valve-side wall of the annular space S by the packing retainer C, and is installed in the annular space S in a compressed and deformed state (crushed state). By being compressed and deformed in the axial direction, the shaft seal portion P makes surface contact between the outer surface of the shaft A and the inner surface of the stuffing box B, thereby exhibiting sealing performance.

[0055] -Effects of Embodiment 1- In this embodiment 1, a mounting jig 10 is used for forming the first and second gland packings 1a and 1b and for mounting (manufacturing) them onto the shaft A. The mounting jig 10 has an inner circumferential surface 11i with a circular cross-section, and is equipped with a cylindrical member 11 that can be attached from the side of the shaft A and has an introduction slit 12 formed therein to guide the tape member 1 from the outside to the inside. After attaching the cylindrical member 11 to the shaft A from the side of the shaft A so as to surround the shaft A, the tape member 1 is fed from the outside to the inside of the cylindrical member 11 through the introduction slit 12, and the tape member 1 is wound around the shaft A inside the cylindrical member 11. Therefore, according to the mounting jig 10 of this embodiment 1, by using a cylindrical member 11 that can be attached from the side of the shaft A without removing various parts around the shaft A, the tape member 1 can be easily formed on the outer circumference of the shaft A simply by feeding it into the introduction slit 12, and the first and second gland packings 1a and 1b are attached to the shaft A at the same time they are formed, so the first and second gland packings 1a and 1b can be easily attached to the shaft A. In other words, by using the mounting jig 10 of this embodiment 1, the first and second gland packings 1a and 1b can be easily manufactured (formed and attached) on the outer circumference of the shaft A.

[0056] Furthermore, in this embodiment 1, the cylindrical member 11 is composed of two separable members (first and second members 11a and 11b) that are connected circumferentially on the outer circumference of the shaft A. According to this embodiment 1, by configuring the cylindrical member 11 in this way, a cylindrical member 11 that can be attached to surround the shaft A from the side can be easily realized.

[0057] Furthermore, in this embodiment 1, the cylindrical member 11 is composed of a main body portion (first part) 13 and an inner fitting portion (second part) 14, each having a different outer shape. The main body portion 13 is formed with an outer shape that cannot be accommodated inside the stuffing box B, while the inner fitting portion 14 is formed in a cylindrical shape that can be fitted inside the stuffing box B. In other words, the cylindrical member 11 is formed with an outer shape having a step between the main body portion 13 and the inner fitting portion 14. When the cylindrical inner fitting portion 14 is fitted inside the stuffing box B, the cylindrical member 11 is positioned in an appropriate location for winding the tape member 1, whose central axis of the inner circumferential surface 11i coincides with the axis of axis A, around axis A. Also, because the stepped portion of the cylindrical member 11 abuts against the axial end face (upper end face) of the stuffing box B, the main body portion 13 is not accommodated inside the stuffing box B and is positioned outside the stuffing box B. After positioning the cylindrical member 11 in such an installation location, the tape member 1 can be fed into the interior of the cylindrical member 11 through the introduction slit 12 formed in the main body 13, thereby winding the tape member 1 around the outer circumference of the shaft A near the stuffing box B, and forming and installing (manufacturing) the first and second gland packings 1a and 1b near the stuffing box B. Therefore, by simply sliding the formed first and second gland packings 1a and 1b slightly in the axial direction along the shaft A, they can be installed in predetermined installation locations within the stuffing box B. Accordingly, the mounting jig 10 of this embodiment 1 not only allows for easy manufacturing (forming and installation) of the first and second gland packings 1a and 1b onto the shaft A, but also allows for easy installation in predetermined installation locations within the stuffing box B.

[0058] Furthermore, according to the mounting method of this embodiment 1, which comprises the above-described mounting step S1 and the first and second winding steps S2 and S4, the cylindrical member 11 of the mounting jig 10 is attached to the shaft A so as to surround the shaft A from the side of the shaft A, and the tape member 1 is fed into the interior of the cylindrical member 11 from the introduction slit 12, thereby winding the tape member 1 around the shaft A inside the cylindrical member 11. In this way, according to the above mounting method, without removing various parts around the shaft A, the first and second gland packings 1a and 1b can be easily formed on the outer circumference of the shaft A simply by feeding the tape member 1 into the introduction slit 12, and since the first and second gland packings 1a and 1b are attached to the shaft A at the same time they are formed, the first and second gland packings 1a and 1b can be easily attached to the shaft A. In other words, according to the mounting method of this embodiment 1, the first and second gland packings 1a and 1b can be easily manufactured (formed and mounted) on the outer circumference of shaft A.

[0059] Furthermore, according to the mounting method of this embodiment 1, since the cylindrical member 11 with a divided structure is used and the first and second members 11a and 11b are connected on the outer circumference of the shaft A in the mounting step S1, the cylindrical member 11 of the mounting jig 10 can be easily attached to the shaft A from the side of the shaft A.

[0060] Embodiment 2 of the Invention Embodiment 2 is a modification of the mounting jig 10 of Embodiment 1. The mounting jig 10 of Embodiment 2 has an additional configuration for smoothly feeding the tape member 1 into the inside of the cylindrical member 11.

[0061] Specifically, as shown in Figures 13 and 14, in Embodiment 2, a plurality of grooves 20 extending in the axial direction are formed on the inner circumferential surface 11i of the cylindrical member 11. In the example shown in Figure 14, 16 grooves 20 are formed at equal intervals in the circumferential direction of the cylindrical member 11. The grooves 20 are formed to extend from the upper end to the lower end of the cylindrical member 11 (from the upper end of the main body portion 13 to the lower end of the inner fitting portion 14). In the examples shown in Figures 13 and 14, the grooves 20 are formed to have a rectangular cross-sectional shape, but the cross-sectional shape of the grooves 20 is not limited to a rectangular shape. The cross-sectional shape of the grooves 30 may be any shape, such as an arc shape, U shape, V shape, trapezoid shape, etc. By providing at least one groove 20 extending in the axial direction on the inner circumferential surface 11i of the cylindrical member 11 in this way, the contact area between the tape member 1 fed into the inside of the cylindrical member 11 and the inner circumferential surface 11i of the cylindrical member 11 is reduced.

[0062] -Effects of Embodiment 2- Embodiment 2 can also achieve the same effects as Embodiment 1.

[0063] Furthermore, according to the mounting jig 10 of Embodiment 2, the tape member 1 is fed from the outside to the inside of the cylindrical member 11 through the introduction slit 12, thereby winding the tape member 1 around the shaft A inside the cylindrical member 11. In this configuration, as the number of turns increases, the frictional force generated between the tape member 1 and the inner circumferential surface 11i of the cylindrical member 11 increases, making it difficult to feed the tape member 1. Therefore, in the mounting jig 10 of Embodiment 2, a plurality of grooves (recesses) 20 are formed on the inner circumferential surface 11i of the cylindrical member 11 to reduce the contact area between the tape member 1 fed into the inside of the cylindrical member 11 from the introduction slit 12 and the inner circumferential surface 11i of the cylindrical member 1. By forming a plurality of grooves 20 on the inner circumferential surface 11i of the cylindrical member 11 in this way, the contact area between the tape member 1 and the inner circumferential surface 11i of the cylindrical member 11 is reduced, thereby decreasing the frictional force generated between the tape member 1 and the inner circumferential surface 11i of the cylindrical member 11. Therefore, with the mounting jig 10 of Embodiment 2, the tape member 1 can be smoothly fed into the cylindrical member 11, making it easy to form the gland packings 1a and 1b and attach them to the shaft A.

[0064] -Modification of Embodiment 2- In Embodiment 2, multiple grooves 20 were provided on the inner circumferential surface 11i of the cylindrical member 11. However, by providing at least one groove 20, the frictional force generated between the tape member 1 and the inner circumferential surface 11i of the cylindrical member 11 can be reduced, allowing the tape member 1 to be smoothly fed into the interior of the cylindrical member 11. Therefore, the number of grooves 20 may be one, or multiple grooves other than 16. Furthermore, the grooves 20 do not have to extend in the axial direction of the cylindrical member 11. For example, they may extend in a direction inclined in the axial direction, or they may extend in a spiral shape.

[0065] In the second embodiment, the groove 20 is an example of a recess for reducing the contact area between the tape member 1, which is fed into the inside of the cylindrical member 11 from the introduction slit 12, and the cylindrical member 11. The recess does not have to be a groove 20. The recess does not have to be linear; for example, it may be a circular or rectangular indentation.

[0066] <Embodiment 3 of the Invention> Embodiment 3 is a modification of the configuration of the mounting jig 10 of Embodiment 1. The mounting jig 10 of Embodiment 2 has an additional configuration for smoothly feeding the tape member 1 into the inside of the cylindrical member 11.

[0067] Specifically, as shown in Figures 15 and 16, in Embodiment 3, a plurality of protrusions 30 are formed on the inner circumferential surface 11i of the cylindrical member 11, projecting inward from the inner circumferential surface 11i. In the example shown in Figures 15 and 16, the protrusions 30 are formed in a hemispherical shape, but the shape of the protrusions 30 is not limited to a hemispherical shape. The plurality of protrusions 30, ..., 30 are arranged evenly distributed in the circumferential direction, as shown in Figure 16. By providing the plurality of protrusions 30 evenly in the circumferential direction on the inner circumferential surface 11i of the cylindrical member 11 in this way, the tape member 1 that is fed into the interior of the cylindrical member 11 will come into contact with the plurality of protrusions 30, but will not come into contact with the inner circumferential surface 11i. Therefore, the contact area between the tape member 1 and the cylindrical member 11 is reduced.

[0068] -Modification of Embodiment 3- Embodiment 3 can also achieve the same effects as Embodiment 1.

[0069] Furthermore, in the mounting jig 10 of Embodiment 3, multiple protrusions 30 are formed on the inner circumferential surface 11i of the cylindrical member 11. In addition, the multiple protrusions 30 are arranged to be evenly distributed in the circumferential direction. By providing multiple protrusions 30 in this way, the contact area between the tape member 1, which is fed into the inside of the cylindrical member 11 from the introduction slit 12, and the cylindrical member 11 is reduced. As a result, the frictional force generated between the tape member 1 and the cylindrical member 11 is reduced due to the presence of multiple protrusions 30. Consequently, with the mounting jig 10 of Embodiment 3, the tape member 1 can be smoothly fed into the inside of the cylindrical member 11, so that the gland packings 1a and 1b can be easily formed and mounted on the shaft A.

[0070] -Modification of Embodiment 3- In Embodiment 3, multiple protrusions 30 were provided on the inner circumferential surface 11i of the cylindrical member 11. However, it is not necessary to provide multiple protrusions 30 as long as they reduce the contact area between the tape member 1 and the cylindrical member 11. For example, if the protrusion 30 extends in a spiral shape, providing just one can reduce the contact area between the tape member 1 and the cylindrical member 11, thereby reducing the frictional force generated between the tape member 1 and the cylindrical member 11, and allowing the tape member 1 to be smoothly fed into the interior of the cylindrical member 11.

[0071] The hemispherical protrusion 30 in Embodiment 3 is an example of a protrusion for reducing the contact area between the tape member 1 fed into the cylindrical member 11 from the introduction slit 12 and the cylindrical member 11, and does not have to be hemispherical as in Embodiment 3. The protrusion for reducing the contact area between the tape member 1 fed into the cylindrical member 11 from the introduction slit 12 and the cylindrical member 11 may be rectangular or linear.

[0072] 《Other Embodiments》 In embodiments 1 to 3 described above, an example of an installation method (manufacturing method) according to the present invention was described in which two gland packings (first and second gland packings 1a and 1b) are installed on a shaft A and placed inside a stuffing box B. However, the installation method (manufacturing method) according to the present invention is not limited to the installation methods (manufacturing methods) of embodiments 1 to 3 above, as long as at least one gland packing (for example, the first gland packing 1a) can be manufactured (formed and installed) on the outer circumference of the shaft A. For this reason, the installation method according to the present invention may consist only of an attachment step S1 and a first winding step S2.

[0073] Furthermore, in embodiments 1 to 3 described above, the mounting jig 10 was provided only with a cylindrical member 11. However, the mounting jig according to the present invention may also include an annular member for sliding the first and second gland packings 1a and 1b, which are manufactured (formed and mounted) on the outer circumference of the shaft A in the first and second winding processes S2 and S4, into the annular space S within the stuffing box B, as described above. The annular member can be shaped to fit inside the cylindrical member 11, for example, a donut-shaped plate-like member or columnar member whose inner circumferential surface abuts against the outer circumferential surface of the shaft A and whose outer circumferential surface abuts against the inner circumferential surface 11i of the cylindrical member 11. The annular member is also configured to be mountable on the shaft A from the side. Specifically, the annular member may be composed of multiple members that can be connected in the circumferential direction, like the cylindrical member 11, or it may consist of two members divided in the circumferential direction, with these two members connected in an openable and closable manner using a torsion spring or the like.

[0074] Furthermore, the mounting jig 10 may also be equipped with an assist mechanism to assist in feeding the tape member 1 into the cylindrical member 11 in the first and second winding processes S2 and S4, such as by sending compressed air into the cylindrical member 11 from the introduction slit 12 using an air pump, or by feeding the tape member 1 of the tape reel into the introduction slit 12 using a driving force such as a motor. According to this embodiment, the work of feeding the tape member 1 into the introduction slit 12 one after another becomes easier, and the first and second winding processes S2 and S4 can be performed more easily.

[0075] Furthermore, in embodiments 1 to 3, the cylindrical member 11 comprises a main body portion 13 and an inner fitting portion 14, but the cylindrical member 11 only needs to have at least a main body portion 13 and does not need to have an inner fitting portion 14.

[0076] Furthermore, in embodiments 1 to 3, the introduction slit 12 was formed to extend in the tangential direction to the inner circumferential surface 11i of the cylindrical member 11, but it is not necessarily required to extend in the tangential direction; it is sufficient if it can guide the tape member 1 from the outside to the inside of the cylindrical member 11.

[0077] This invention is useful for mounting jigs and mounting methods for gland packing.

[0078] 1 Tape member 1a First gland packing (gland packing) 1b Second gland packing (gland packing) 10 Mounting jig 11 Cylindrical member 11i Inner surface 12 Introduction slit 13 Main body (first part) 14 Inner fitting part (second part) 20 Groove (recess) 30 Protrusion d Diameter of the inner surface of the cylindrical member d1 Outer diameter of the shaft d2 Inner diameter of the stuffing box S1 Mounting process S2 First winding process (winding process) S4 Second winding process (winding process)

Claims

1. A mounting jig for mounting a gland packing, which is formed by winding a tape member, onto a shaft, comprising a cylindrical member attached to the shaft so as to surround the shaft, having an inner surface with a circular cross-section and a diameter larger than the outer diameter of the shaft and less than or equal to the inner diameter of a stuffing box in which the gland packing is housed, wherein the cylindrical member has an introduction slit formed therein to guide the tape member from the outside of the cylindrical member to the inside of the cylindrical member, and the cylindrical member is configured to be attachable from the side of the shaft.

2. The mounting jig according to claim 1, characterized in that the cylindrical member is composed of a plurality of separable members connected in the circumferential direction on the outer circumference of the shaft.

3. The mounting jig according to claim 1 or 2, wherein the inner circumferential surface of the cylindrical member has a smaller diameter than the inner diameter of the stuffing box, the cylindrical member has a first portion having an outer shape that cannot be accommodated in the stuffing box, and a second cylindrical portion that is continuous with the first portion and can be fitted into the stuffing box, and the introduction slit is formed in the first portion.

4. The mounting jig according to claim 1 or 2, characterized in that recesses or protrusions are formed on the inner circumferential surface of the cylindrical member so as to reduce the contact area between the tape member, which is fed into the inside of the cylindrical member from the introduction slit, and the cylindrical member.

5. A mounting method for mounting a gland packing, which is formed by winding a tape member, onto a shaft using the mounting jig described in claim 1, comprising: a mounting step of attaching the cylindrical member to the shaft from the side; and a winding step of feeding the tape member into the introduction slit of the cylindrical member attached to the shaft, thereby winding the tape member around the outer circumference of the shaft inside the cylindrical member to form the gland packing and mounting it onto the shaft.

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