Gland packing replacement device and replacement method

Abstract

To provide a gland packing exchange device which can reliably and easily exchange a packing without leaving residue of an old gland packing, and an exchange method.SOLUTION: A gland packing exchange device for a gland packing that seals a clearance between an external peripheral face of a shaft or a pipe and an internal peripheral face of a cylindrical support part into which the shaft or the pipe is inserted, comprises: a removal arm having a main portion and a pair of arm parts bifurcated from the main portion; an engagement portion that is located outside the support part and is engaged with a tip of the removal arm; and a circular ring member fixed to an upper part of the support part so as to lie opposite the gland packing. The main portion of the removal arm is turned to a side of the circular ring member with the tip of the removal arm engaged with the engagement portion and the arm parts connected to both radial end portions of the external peripheral face of the support part. Then, the gland packing is pushed up together with the support part with the engagement portion as a fulcrum, and the gland packing is pressed against the circular ring member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a gland packing replacement device and a gland packing replacement method using the gland packing replacement device. [Background technology]

[0002] In fluid machinery such as valves and pumps, gland packings are used to seal between the shaft and the bearing tube through which the shaft passes in order to seal the sliding parts. However, gland packings become deformed and damaged over long periods of use, reducing their sealing performance, and so are periodically replaced with new ones.

[0003] When replacing gland packing, special tools such as a prong-type tool with a sharp, curved cutting edge at the tip and a screw-type tool with a sharp male screw at the tip are used. The prong-type tool is pierced into the gland packing to hook it, or the male screw is pierced into the gland packing to screw it in, and then the special tool is pulled up to remove the gland packing. If the old gland packing to be replaced remains in the installation location, the new gland packing will not be installed properly and its sealing performance will decrease, so it is necessary to completely remove the old gland packing, which requires effort, time, and a certain level of skill.

[0004] In addition, gland packings generally have a multi-layer structure in which multiple gland packings are stacked in the axial direction of the shaft. When replacing a gland packing with this multi-layer structure, the old gland packing must be removed layer by layer using the above-mentioned special tool, which is time-consuming. Furthermore, if the tip of the special tool is not properly inserted between adjacent gland packings and pulled up, the gland packing may be damaged or cut off in the middle.

[0005] Therefore, for example, Patent Document 1 proposes a removal device for a multi-stage gland packing in which fluid pressure is supplied between adjacent gland packings, causing at least one layer of gland packing to move axially in the mounting portion, and removing the gland packing that has moved axially.

[0006] In addition, in order to detect the piled-up state of charge materials such as iron ore and coke supplied to a blast furnace and control the next supply amount to maintain stable operation, the surface profile of the charge materials supplied to the furnace and piled up in the blast furnace is detected. The present applicant has also previously proposed a detection device described in Patent Document 2.

[0007] FIG. 5 shows the detection device 100 shown in FIG. 2 of Patent Document 2. The main part of the device is provided with an angle-variable reflector 140, in which the inclination angle (X direction) of the reflecting surface 140a toward the blast furnace side is variable, and angle-fixed reflectors 138A to 138C (138). A gear 112 on the outer circumferential surface of the rotating shaft 110 meshes with a gear 155 of a motor 113. By driving the motor 113, the rotating shaft 110 rotates in the Y direction, and the rotating plate 120 rotates horizontally with respect to the opening 2 of the blast furnace 1. A first link 117a of a link mechanism 117 is fixed to the angle-variable reflector 140, and a second link 117b is connected to the first link 117a. Further, a connecting rod 114 penetrating inside the rotating shaft 110 is connected to the second link 117b, and as the connecting rod 114 moves up and down in the H direction, the reflecting surface 140a of the angle-variable reflecting plate 140 is tilted in the X direction. Then, by tilting the reflecting surface 140a of the angle-variable reflecting plate 140 while rotating the rotating plate 120 together with the rotating shaft 110, the detection wave M transmitted from the transmitting / receiving means 130 via the antenna 135 scans the surface profile of the charge in the blast furnace linearly or planarly.

[0008] In this detection device 100, dangerous gases inside the blast furnace 1 enter the rotating shaft 110 through the opening 2, and the inside of the rotating shaft 110 is under high pressure, while the upper side of the rotating shaft 110 in the figure is under low pressure (atmospheric pressure). Therefore, parts A and B surrounded by circles in the figure, i.e., the spaces between the top surface of the rotating shaft 110 and the connecting rod 114 and the waveguide 133 of the antenna 135, are sealed with gland packing (not shown, see Figure 1). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2019-218983 A [Patent Document 2] Patent No. 6857933 Summary of the Invention [Problem to be solved by the invention]

[0010] However, as mentioned above, using dedicated tools requires effort, time, and a certain level of skill, and the removal device of Patent Document 1 requires a supply pipe for supplying the fluid, a fluid supply source, a fluid adjustment valve, etc., making the device structure complex.

[0011] In addition, as devices become smaller, the space around the gland packing attachment point becomes narrower, making replacement work in a small space more difficult. In particular, in a detection device such as that in Patent Document 2, the space above the rotating shaft 110 is narrowed to make the device smaller, making replacement work more difficult.

[0012] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a gland packing replacement device and method that can be performed reliably and easily without leaving any old gland packing behind, and that does not require complicated equipment. [Means for solving the problem]

[0013] In order to solve the above problems, the present invention provides the following gland packing replacement device and replacement method. (1) A device for replacing a gland packing that seals between an outer peripheral surface of a shaft or a pipe and an inner peripheral surface of a cylindrical support part through which the shaft or the pipe is inserted, comprising: a detachment arm having a main portion and a pair of arms branching off from the main portion; an engagement portion located outside the support portion and adapted to engage with a tip of the arm portion of the removal arm; A circular ring member fixed above the support portion so as to face the gland packing; In addition to providing With the tip of the arm portion of the removal arm engaged with the engagement portion and the arm portion connected to both radial end portions of the outer circumferential surface of the support portion, A gland packing replacement device characterized in that the main part of the removal arm is rotated toward the circular member, and the gland packing is pushed up together with the support part using the engagement part as a fulcrum, and the gland packing is pressed against the circular member. (2) A method for replacing a gland packing that seals between an outer peripheral surface of a shaft or a pipe and an inner peripheral surface of a cylindrical support part through which the shaft or the pipe is inserted, comprising the steps of: The exchange device described in (1) above is used, The main part of the removal arm is rotated toward the annular member, and the gland packing is pushed up together with the support part with the engagement part as a fulcrum, and the gland packing is pressed against the annular member, thereby pushing the gland packing downward from the support part, and then A method for replacing a gland packing, comprising inserting a new gland packing into the support portion from the side of the annular member to replace the gland packing. (3) The gland packing has a multi-stage structure in which a plurality of gland packings are stacked in multiple stages, The method for replacing a gland packing described in (2) above, characterized in that a series of operations are repeated: rotating the main part of the removal arm toward the circular member, pushing up the gland packing together with the support part using the engagement part as a fulcrum, pressing the gland packing against the circular member to push the gland packing downward from the support part, and then inserting a new gland packing into the support part from the side of the circular member to replace it. Effect of the Invention

[0014] In the present invention, the old gland packing can be removed by pushing up the removal arm, and a new gland packing can be added by a simple operation, so that the old gland packing can be replaced with a new one without leaving any residue of the old gland packing. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view showing an embodiment of an exchange device of the present invention, showing the state before exchange. [Diagram 2] FIG. 2 is a top view showing the support and removal arm of the exchange device shown in FIG. [Diagram 3] FIG. 3 shows a state in which the main portion of the removal arm is pushed up. [Figure 4] FIG. 4 is a diagram showing a state in which a new gland packing is being added. [Diagram 5] FIG. 5 is a diagram illustrating a main part of the detection device shown in FIG. 2 of Patent Document 2. In FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The present invention will now be described in detail with reference to the drawings.

[0017] Fig. 1 is a cross-sectional view showing an embodiment of the exchange device of the present invention, showing the state before exchange. A gland packing 30 is installed between a shaft or a pipe (pipe 10 in the example shown) and a support part 20 through which the pipe 10 is inserted.

[0018] The support portion 20 is attached to a support frame 25 by bolts 26. In addition, on the outside of the support portion 20, a circular enclosure 60 is attached to the support frame 25 by bolts 66.

[0019] The gland packing 30 has a multi-layer structure with three layers stacked above and below the lantern ring 40, totaling six layers in the illustrated example, and is pressed from above by the gland packing retainer 35 and fixed to the support part 20. The gland packing retainer 35 presses its claw-shaped projections 36 against the top gland packing 30 (reference symbol "30A"), and is attached to the support part 20 by bolts 37 in a pressed state.

[0020] A circular member 50 is disposed above the gland packing retainer 35 at a position facing the gland packing 30. The circular member 50 is attached to and fixed to a support frame 55.

[0021] The lantern ring 40 is provided to supply grease or oil from the outside to the mounting location of the gland packing 30 through an injection hole 45 provided in the support part 20, and to fill the gap between the pipe 10 and the support part 20 and the gap between the gland packings, thereby improving the sealing performance. The lantern ring 40 is also divided into two pieces.

[0022] A removal arm 70 is connected to the outer circumferential surface of the support part 20. As shown in FIG. 2, the removal arm 70 is a generally Y-shaped member having a pair of arms 76 that are bifurcated from a main part 75. Each arm 76 has a long hole 77 whose major axis is the longitudinal direction of the arm 76. A fixing pin 80 is inserted through the long hole and fixed to the outer circumferential surface of the support part 20, thereby connecting the removal arm 70 to the support part 20. For simplicity, only the support part 20, the enclosure 60, and the removal arm 70 are shown in FIG. 2.

[0023] The inner peripheral surface of the enclosure 60 has a pair of protrusions 68 that engage with the tips of the arms 76 of the removal arm 70. The enclosure 60 also has an opening 69 on the side facing the protrusions 68, allowing the main part 75 of the removal arm 70 to protrude through. Although not shown in the figure, in addition to the protrusions 68, there may be a hole through which the tip of the arm 76 of the removal arm 70 is inserted. This hole or the protrusions 68 is the "engagement part."

[0024] To replace the gland packing 30 using the replacement device 5 configured as above, the following series of operations are carried out.

[0025] First, the bolts 37 are removed, and the gland packing retainer 35 is removed from the support portion 20. In addition, the bolts 26 that attach the support portion 20 to the support frame 25 are removed.

[0026] Next, the removal arm 70 is inserted through the opening 69 of the enclosure 60, and the tip of the arm 76 is engaged with the protrusion 68 of the enclosure 60. At the same time, the fixing pin 80 is inserted into the long hole 77 and fixed to the outer circumferential surface of the support part 20.

[0027] 3, the main part 75 of the removal arm 70 is rotated toward the annular member 50 as shown by the arrow a in FIG. 1. As a result, the gland packing 30 is pushed up together with the support part 20 toward the annular member 50 by the "leverage principle" with the engagement point between the tip of the arm part 76 of the removal arm 70 and the protrusion part 68 of the enclosure 60 as the fulcrum. In the example shown in the figure, the main part 75 of the removal arm 70 is protruding from the opening 69 of the enclosure 60, but the main part 75 does not have to protrude from the opening 69 of the enclosure 60. By this pushing up, the topmost gland packing 30A is pressed by the annular member 50, and at the same time, the bottommost gland packing 30 (reference symbol "30B") is pushed downward from the support part 20.

[0028] Next, as shown in Fig. 4, the main part 75 of the removal arm 70 is returned to its original position. In this state, five layers of gland packing 30 remain in the support part 20, with the bottom layer gland packing 30B having been pushed out, as shown in Fig. 4. Therefore, a new gland packing 30 (reference symbol "30C") is inserted into the support part 20 from the side of the annular member 50 to replenish it.

[0029] The raising and lowering of the removal arm 70 and the replenishment of new gland packing 30C are each repeated three times, and the lantern ring 40 is then pushed out from the support part 20, after which the pushed-out lantern ring 40 is repositioned on the support part 20 from the side of the annular member 50. Three layers of gland packing 30 are then replenished on top of the lantern ring 40.

[0030] Then, after the support portion 20 is attached to the support frame 25 with the bolts 26, the gland packing 30 is pressed by the gland packing retainer 35 and attached to the support portion 20 with the bolts 37, thereby completing the replacement work.

[0031] 1 to 4, the removal arm 70 is located on the right side in the drawings, but the present invention is not limited thereto, and the removal arm 70 can be moved in any direction relative to the support portion 20.

[0032] The above-described exchange device 5 can be widely applied to sealing parts of fluid machines such as valves and pumps, and the detection device of Patent Document 2. [Explanation of symbols]

[0033] 5 Exchange device 10 tubes 20 Support part 30 Gland packing 35 Gland packing retainer 40 Lantern Ring 50 Circular member 60 Enclosure 68 Projection (engaging part) 70 Removable arm 75 Main Section 76 Arm 80 Fixing pin

Claims

1. A gland packing replacement device that seals between an outer peripheral surface of a shaft or a pipe and an inner peripheral surface of a cylindrical support part through which the shaft or the pipe is inserted, a detachment arm having a main portion and a pair of arms branching off from the main portion; an engagement portion located outside the support portion and adapted to engage with a tip of the arm portion of the removal arm; A circular ring member fixed above the support portion so as to face the gland packing; In addition to providing With the tip of the arm portion of the removal arm engaged with the engagement portion and the arm portion connected to both radial end portions of the outer circumferential surface of the support portion, A gland packing replacement device characterized in that the main part of the removal arm is rotated toward the circular member, and the gland packing is pushed up together with the support part using the engagement part as a fulcrum, and the gland packing is pressed against the circular member.

2. A method for replacing a gland packing that seals between an outer peripheral surface of a shaft or a pipe and an inner peripheral surface of a cylindrical support part through which the shaft or the pipe is inserted, comprising the steps of: Using the exchange device according to claim 1, The main part of the removal arm is rotated toward the annular member, and the gland packing is pushed up together with the support part with the engagement part as a fulcrum, and the gland packing is pressed against the annular member, thereby pushing the gland packing downward from the support part, and then A method for replacing a gland packing, comprising inserting a new gland packing into the support portion from the side of the annular member to replace the gland packing.

3. The gland packing has a multi-stage structure in which a plurality of gland packings are stacked in multiple stages, The method for replacing a gland packing as described in claim 2, characterized in that a series of operations is repeated: rotating the main part of the removal arm toward the circular member, pushing up the gland packing together with the support part using the engagement part as a fulcrum, pressing the gland packing against the circular member to push the gland packing downward from the support part, and then inserting a new gland packing into the support part from the side of the circular member to replace it.

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