A shaft seal packing extractor

Abstract

The present invention discloses a shaft seal packing extractor. By adjusting the positioning nut, the axial length of the shaft seal packing extractor is changed. Before use, the front disc and the tail disc respectively press against the equipment body on both axial sides to ensure that the extractor will not be displaced, making it more convenient for subsequent packing extraction operations. The extension rod and the turning tap can be placed inside the stuffing box space for assembly when the axial space is narrow and the depth of the packing is large, solving the problem that a longer tap cannot be used in a limited space. The use of a coarse-thread tap instead of the previous spiral needle makes it easier to pierce the harder carbonized packing. The structure of the present invention is simple and the operation is convenient, which is suitable for the extraction of shaft seal packing with a large packing depth, a narrow axial space, and a large packing hardness.

Description

Technical Field

[0001] The present invention belongs to the technical field of packing removal tools, and particularly relates to a shaft seal packing removal tool. Background Art

[0002] Our factory uses packing as the shaft seal packing for the polyoxymethylene reactor. A large number of packings are used and the depth is relatively large. The packing is a consumable item. During the long-term use, materials invade the inside of the packing, making it lose elasticity, carbonize when heated, reducing the sealing effect, resulting in leakage of materials from the shaft seal, air intake, etc., affecting the pressure control of the reactor. The air intake of the reactor will cause the reaction effect to deteriorate, reduce the conversion rate, increase by-products, etc., affecting the product quality. Due to the large depth of the shaft seal packing, the narrow axial space, and the large hardness of the packing, it is not easy to remove during replacement. In the past, a long-handled needle-like removal tool was usually used to replace the packing. Its disadvantage is that it takes 2 - 3 days to replace the packing once, and only the outer packing can be removed. It is very difficult to remove and replace the inner several layers of packing without disassembling the equipment. Summary of the Invention

[0003] In order to solve the problem of difficult removal of the existing shaft seal packing, the present invention provides a shaft seal packing removal tool.

[0004] The purpose of the present invention is achieved in the following way:

[0005] A shaft seal packing removal tool includes a front disc, a middle disc, and a tail disc arranged in sequence from top to bottom. A disc axial adjustment mechanism and a tap movement adjustment mechanism are provided between the arc-shaped discs. The disc axial adjustment mechanism includes a connecting bolt fixed on the lower surface of the front disc, a positioning nut, and a fixing rod. The upper end of the positioning nut is threadedly connected to the connecting bolt, and the lower end passes through the middle disc and is threadedly connected to the fixing rod. A stop block for supporting the middle disc is provided on the upper part of the fixing rod, and the end of the fixing rod is installed on the tail disc; the tap movement adjustment mechanism includes a push bolt, an extension rod, a turning tap, and a lifting pad. The lower end of the push bolt is inserted into the middle disc and is threadedly connected to the middle disc. The upper end of the extension rod passes through the push bolt and is inserted into the push bolt, and the lower end passes through the tail disc and is threadedly connected to the turning tap. A hexagonal nut end is fixed at the upper end of the extension rod. A locking nut is provided at the end of the turning tap close to the tail disc. A U-shaped through groove is opened on the tail disc. A limit convex platform is provided on the upper part of the lifting pad, and the lifting pad is stuck in the U-shaped through groove through the limit convex platform.

[0006] The disc axial adjustment mechanism and the tap movement adjustment mechanism are arranged at intervals.

[0007] The tail end of the positioning nut is designed as an internal thread cylinder, and the whole fixing rod is designed as a cylinder. A screw rod is provided at the front end, and an internal thread is provided at the tail end. The tail end of the positioning nut is threadedly connected to the internal thread at the front end of the fixing rod, and the middle disc has an axial movement margin.

[0008] The end of the fixed rod is installed on the tail disk. A T-shaped hole is provided on the tail disk. The fixed rod passes through the T-shaped hole on the tail disk and is installed on the tail disk through the fixed rod fixing bolt. The tail disk has an axial movement allowance.

[0009] The end of the propulsion bolt is designed as a hollow cylinder, and the front end of the extension rod is designed as a cylinder. The two have matching dimensions.

[0010] By adjusting the positioning nut, the axial length of the shaft seal packing extractor is changed. Before use, the front disk and the tail disk respectively press against the equipment body on both axial sides to ensure that the extractor does not displace, making the subsequent packing removal operation more convenient. The extension rod and the turning tap can be assembled inside the stuffing box space under the condition of a narrow axial space and a large depth of the packing. This solves the problem that a long tap cannot be used in a limited space. Using a coarse-thread tap instead of the previous spiral needle is easier to pierce the harder carbonized packing. The structure of the present invention is simple and the operation is convenient, and it is applicable to the removal of shaft seal packing with a large packing depth, a narrow axial space, and a large packing hardness. Brief Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of the present invention.

[0012] Figure 2 is a schematic structural diagram of another angle of the present invention.

[0013] Figure 3 is the front view of the present invention.

[0014] Figure 4 is an exploded view of the disk axial adjustment mechanism and the tap movement adjustment mechanism of the present invention.

[0015] Figure 5 is a schematic structural diagram of the lifting pad in the present invention.

[0016] Figure 6 is a schematic diagram of the use state of the present invention.

[0017] Among them, 1 - front disk, 101 - connecting bolt, 2 - middle disk, 201 - positioning nut, 202 - fixed rod, 2021 - stop block, 203 - fixed rod fixing bolt, 3 - tail disk, 4 - propulsion bolt, 5 - extension rod, 501 - hexagonal nut end, 6 - turning tap, 601 - locking nut, 7 - lifting pad, 71 - limiting boss. Detailed Embodiment

[0018] As Figures 1-5As shown in the figure, a shaft seal packing extractor includes a front disk 1, a middle disk 2, a tail disk 3, a disk axial adjustment mechanism and a tap movement adjustment mechanism. The front disk 1, the middle disk 2, and the tail disk 3 are all arc-shaped and are arranged in sequence from top to bottom. The disk axial adjustment mechanism includes a connecting bolt 101 fixed to the lower surface of the front disk 1, a positioning nut 201, and a fixing rod 202. The connecting bolt 101 can be welded to the lower surface of the front disk 1, or a threaded hole can be started from the front disk 1, and the connecting bolt 101 extends into the threaded hole and is threadedly connected to the front disk 1; the positioning nut 201 can be designed as a hexagonal cylinder convenient for tools such as wrenches to turn. The upper end of the positioning nut 201 is threadedly connected to the connecting bolt 101, and the lower end of the positioning nut 201 is designed as an internal thread cylinder. A circular hole is provided on the middle disk 2 for the cylinder at the lower end of the positioning nut 201 to pass through. The tail end of the positioning nut 201 is threadedly connected to the front end of the fixing rod 202. The axial length of the thin diameter part at the tail of the positioning nut 201 is slightly greater than the thickness of the middle disk 2, ensuring that when the positioning nut 201 is turned to adjust the axial telescopic distance of the extractor, the middle disk 2 has an axial movement margin of about 1 mm; the fixing rod 202 is designed as a cylinder as a whole, and a block 2021 for supporting the middle disk is provided on the upper part. A screw rod is provided at the front end of the block 2021, and an internal thread is provided at the tail end. The front end of the fixing rod 202 is threadedly connected to the internal thread of the positioning nut 201, and the tail end of the fixing rod 202 is installed on the tail disk 3; the tail end of the fixing rod 202 is installed on the tail disk 3. A T-shaped hole is provided on the tail disk 3, and the fixing rod 202 passes through the T-shaped hole on the tail disk 3. The fixing rod 202 at the tail end in the T-shaped hole is screwed by a fixing rod fixing bolt 203 to install the fixing rod 202 on the tail disk 3, and the tail disk also has an axial movement margin of about 1 mm.

[0019] The tap movement adjustment mechanism includes a push bolt 4, an extension rod 5, a turning tap 6, and a lifting pad 7. The tail end of the push bolt 4 is designed as a hollow cylinder. The upper end of the extension rod 5 is fixed with a hexagonal nut end 501. The front end of the extension rod before the hexagonal nut end 501 is designed as a cylinder, and the size matches the hollow cylinder at the tail end of the push bolt 4, ensuring that the cylinder at the front end of the extension rod 5 penetrates into the tail end of the push bolt 4 and is inserted into the push bolt 4. The push bolt 4 is inserted into the middle disk 2 at one end and is threadedly connected to the middle disk 2. A U-shaped through groove is provided on the tail disk 3. The lower end of the extension rod 5 passes through the U-shaped through groove on the tail disk 3 and is threadedly connected to the turning tap 6. The front end of the turning tap 6 is designed with an external thread, and the tail end is designed with a thick thread tap. A locking nut 601 is provided at the end of the turning tap 6 close to the tail disk 3. A limiting boss 71 is provided on the upper part of the lifting pad 7, and the lifting pad 7 is stuck in the U-shaped through groove through the limiting boss 71.

[0020] Design multiple lifting pad parts 7 according to the actual situation to meet the applications under different conditions. The thicknesses of the limit bosses 71 on each lifting pad part 7 are different. The determining factors for the thickness of the limit boss 71 are the thickness and depth of the packing to be removed and the length matching of the tapping screw 6 inserted. When the tapping screw 6 inserted pierces the packing, select a lifting pad part 7 with an appropriate height according to the axial distance from the hexagonal nut end 501 at the upper part of the extension rod 5 to the tail disk 3 at this time. The lifting pad part 7 with an appropriate height means that the axial distance from the hexagonal nut end 501 on the extension rod 5 to the tail disk 3 is equal to the thickness of the limit boss 71 of the lifting pad part 7.

[0021] The disk axial adjustment mechanism and the tapping screw movement adjustment mechanism are arranged at intervals. As shown in the figure, there are three groups of disk axial adjustment mechanisms and two groups of tapping screw movement adjustment mechanisms in the figure. The size of the packing extractor is appropriately and reasonably adjusted according to the diameter of the equipment shaft. When the packing extractor is larger, several groups of disk axial adjustment mechanisms and tapping screw movement adjustment mechanisms can be designed to take out a larger amount of packing at one time. If the diameter of the equipment shaft is smaller, the packing extractor is designed smaller accordingly. The disk axial adjustment mechanism can be designed into two groups, and the tapping screw movement adjustment mechanism can be designed into one group or two groups.

[0022] Working process:

[0023] As Figure 6 shown, first, orient the arc-shaped opening of the shaft seal packing extractor towards the equipment shaft. According to the axial space size of the equipment body, rotate the positioning nut 201. The positioning nut 201 and the connecting bolt 101 are displaced to adjust the distance between the front disk 1 and the tail disk 3, so that the front disk 1 presses tightly against the upper part of the equipment body, and the tail disk 3 presses tightly against the lower part of the equipment body. After pressing tightly up and down, the shaft seal packing extractor is not likely to be displaced, facilitating the subsequent operation of removing the packing. Then, turn the upper end of the pushing bolt 4, and the pushing bolt 4 drives the extension rod 5 and the tapping screw 6 inserted to move downward together and pierce into the packing. Then turn the hexagonal nut end 501 at the upper part of the extension rod to make the tapping screw 6 inserted pierce the packing. Select a lifting pad part 7 with an appropriate height according to the axial distance from the hexagonal nut end 501 at the upper part of the extension rod 5 to the tail disk 3 at this time. The lifting pad part 7 is clamped into the U-shaped through groove of the tail disk 3, and the hexagonal nut end 501 at the upper part of the extension rod 5 is placed on the upper surface of the limit boss 71 of the lifting pad part 7. At this time, turn the hexagonal nut end 501 at the upper part of the extension rod 5 again, and the extension rod 5 and the tapping screw 6 inserted no longer continue to move downward. The packing is taken out as the tapping screw 6 inserted rotates, and the packing removal is completed.

[0024] By adjusting the positioning nut 201, the axial length of the shaft seal packing extractor is changed. Before use, the front disc 1 and the tail disc 3 are respectively tightened against the equipment body on both axial sides to ensure that the extractor will not be displaced, making the subsequent packing extraction operation more convenient. The extension rod 5 and the turning tap 6 can be assembled inside the stuffing box space when the axial space is narrow and the packing depth is large, solving the problem that a longer tap cannot be used in a limited space. Using a coarse-thread tap instead of the previous spiral needle is easier to pierce the harder carbonized packing. The structure of the present invention is simple and the operation is convenient, and it is applicable to the extraction of shaft seal packing with a large packing depth, a narrow axial space, and a large packing hardness.

[0025] The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the overall concept of the present invention, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present invention.

Claims

1. A shaft seal packing extractor, characterized in that: It includes a front disk (1), a middle disk (2), and a tail disk (3) arranged successively from top to bottom. A disk axial adjustment mechanism and a tap movement adjustment mechanism are provided between the arc-shaped disks. The disk axial adjustment mechanism includes a connecting bolt (101) fixed to the lower surface of the front disk (1), a positioning nut (201), and a fixing rod (202). The upper end of the positioning nut (201) is threadedly connected to the connecting bolt (101), and the lower end passes through the middle disk (2) and is threadedly connected to the fixing rod (202). A stop block (2021) for supporting the middle disk is provided on the upper part of the fixing rod (202), and the end of the fixing rod (202) is installed on the tail disk (3). The tap movement adjustment mechanism includes a push bolt (4), an extension rod (5), a turning tap (6), and a lifting pad (7). The lower end of the push bolt (4) is inserted into the middle disk (2) and is threadedly connected to the middle disk (2). The upper end of the extension rod (5) passes through the push bolt (4) and is inserted into the push bolt (4), and the lower end passes through the tail disk (3) and is threadedly connected to the turning tap (6). A hexagonal nut end (501) is fixed to the upper end of the extension rod (5). A locking nut (601) is provided at the end of the turning tap (6) close to the tail disk (3). A U-shaped through groove is formed on the tail disk (3). A limit boss (71) is provided on the upper part of the lifting pad (7), and the lifting pad (7) is clamped in the U-shaped through groove through the limit boss (71).

2. The shaft seal packing extractor according to claim 1, wherein: The disk axial adjustment mechanism and the tap movement adjustment mechanism are arranged at intervals.

3. The shaft seal packing extractor according to claim 1, wherein: The tail end of the positioning nut (201) is designed as an internal thread cylinder, and the whole fixing rod (202) is designed as a cylinder. A screw rod is provided at the front end, and an internal thread is provided at the tail end. The tail end of the positioning nut (201) is threadedly connected to the internal thread at the front end of the fixing rod (202), and the middle disk (2) has an axial movement margin.

4. The shaft seal packing extractor according to claim 1, characterized in that: The end of the fixing rod (202) is installed on the tail disk (3). A T-shaped hole is provided on the tail disk. The fixing rod (202) passes through the T-shaped hole on the tail disk and is installed on the tail disk (3) through a fixing rod fixing bolt (203), and the tail disk has an axial movement margin.

5. The shaft seal packing extractor according to claim 1, wherein: The tail end of the push bolt (4) is designed as a hollow cylinder, and the front end of the extension rod (5) is designed as a cylinder, and their sizes are matched.

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