CN210704554U - Dismounting device for shaft seal packing set - Google Patents

Abstract

The utility model provides a dismounting device for bearing seal packing group. The dismounting device comprises: a connecting rod; the balance hook is rotatably arranged relative to the connecting rod and provided with at least two supporting ends, the balance hook is provided with a first position and a second position, and when the balance hook is positioned at the first position, the balance hook can penetrate through the shaft seal packing group so that the shaft seal packing group is sleeved on the periphery of the connecting rod; when the balancing hook is in the second position, at least two support ends of the balancing hook are in abutting contact with the shaft seal packing set. The technical scheme of the utility model the lower problem of the bearing seal packing group efficiency of the dismantlement valve among the correlation technique has been solved effectively.

Description

Dismounting device for shaft seal packing set

Technical Field

The utility model relates to a valve overhauls assembly and disassembly tools field particularly, relates to a dismounting device for bearing seal packing group.

Background

In some systems with valve combination, one or more valves are in fault and the whole system is directly stopped, so that the overhaul time of an overhaul personnel for on-site fault valves directly determines the time for the system to recover normal operation, the shorter the overhaul time is, the faster the system recovers normal operation is, thereby ensuring the production capacity of enterprises and reducing unnecessary loss. In the field maintenance process of the valve, the maintenance condition is often very harsh, for example, the maintenance personnel may work in a high-temperature or low-temperature environment and the maintenance operation space is very narrow, and the longer the maintenance time of the maintenance personnel under the harsh condition is, the larger the labor loss is.

In the related art, a dismounting device for a shaft seal packing set of a valve includes a connecting rod and a hook body connected with the connecting rod, wherein the hook body is fixedly arranged with the connecting rod and cannot rotate relative to the connecting rod. Therefore, in the process of taking out the shaft seal packing group by using the hook body, the shaft seal packing group is easy to incline, so that the phenomenon of blocking is caused, and the shaft seal packing group is difficult to take out from the valve body of the valve.

That is, there is a problem in the related art that the efficiency of disassembling the packing group of the shaft seal is low.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a dismounting device for shaft seal packing group to solve the problem of lower efficiency of dismounting the shaft seal packing group in the related art.

In order to achieve the above object, according to the utility model provides a dismounting device for bearing seal packing group, dismounting device includes: a connecting rod; the balance hook is rotatably arranged relative to the connecting rod and provided with at least two supporting ends, the balance hook is provided with a first position and a second position, and when the balance hook is positioned at the first position, the balance hook can penetrate through the shaft seal packing group so that the shaft seal packing group is sleeved on the periphery of the connecting rod; when the balancing hook is in the second position, at least two support ends of the balancing hook are in abutting contact with the shaft seal packing set.

Further, the dismounting device also comprises a pivot shaft, and the balance hook is pivotally connected with the connecting rod through the pivot shaft.

Further, the balance hook is switchable between the first position and the second position by an external force.

Furthermore, the dismounting device also comprises a limiting structure arranged on the connecting rod, and the limiting structure is used for limiting the rotating angle of the balance hook.

Furthermore, the limiting structure is a groove formed in one end of the connecting rod.

Further, the balance hook comprises a hook body and a protrusion connected with the hook body, an axis L1 of the protrusion coincides with a central axis L2 of the connecting rod, and the oppositely arranged first and second ends of the hook body form two support ends.

Further, the bulge is arc-shaped, and the length L of the bulge is less than or equal to the inner diameter of the shaft seal packing group.

Furthermore, the dismounting device further comprises a pivot shaft, a first mounting hole arranged on the protrusion and a second mounting hole arranged on the connecting rod, wherein the second mounting hole is communicated with a groove formed in one end of the connecting rod, and the pivot shaft penetrates through the first mounting hole and the second mounting hole.

Further, the dismounting device also comprises a nut, at least part of the outer surface of the connecting rod is provided with an external thread, and the nut is matched with the external thread.

Further, the dismounting device also comprises a pressing piece, the pressing piece is provided with a through hole, and the pressing piece is arranged on the periphery of the connecting rod.

Use the technical scheme of the utility model, the balance hook rotationally sets up for the connecting rod, the balance hook has two at least support ends of group's butt contact at circumference direction and bearing seal filler to can provide even effort for bearing seal filler group at the dismantlement in-process, and like this, at the in-process that promotes the connecting rod, bearing seal filler group can rise along the axial of valve body, be difficult for appearing in the correlation technique because the bearing seal filler group easily inclines the card pause or pause phenomenon that causes, thereby improved the efficiency of taking out bearing seal filler group.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of an embodiment of a dismounting device for a shaft seal packing group according to the present invention;

fig. 2 shows a schematic view of the structure of the balancing hook of the dismounting device of fig. 1;

figure 3 shows a schematic structural view of the connecting rod of the dismounting device of figure 1;

figure 4 shows a schematic view of the coupling rod and balance hook cooperation of the dismounting device of figure 1;

FIG. 5 shows a schematic view of the removal device of FIG. 1 in engagement with a packing set of a shaft seal (with the balancing hook in a first position);

FIG. 6 shows a schematic view of the removal device of FIG. 1 in engagement with a packing set of a shaft seal (with the balancing hook in a second position); and

fig. 7 is a schematic view of the balance hook of the dismounting device of fig. 1 in a third position.

Wherein the figures include the following reference numerals:

10. a connecting rod; 11. a groove; 111. a side wall; 112. a bottom surface; 12. a second mounting hole; 20. a balance hook; 21. a hook body; 211. a first end; 212. a second end; 22. a protrusion; 23. a first mounting hole; 30. a pivotal shaft; 40. a nut; 50. a compression member; 60. and a shaft seal packing set.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

The utility model discloses an in the embodiment of the utility model, the valve includes the valve body, sets up the valve rod in the valve body and sets up the bearing seal packing group 60 in the valve rod periphery. The shaft seal packing group 60 includes a plurality of seals (also sometimes referred to as "packing") arranged in sequence, and in order to efficiently replace or disassemble the shaft seal packing group, the utility model provides a disassembling device.

As shown in fig. 1, the dismounting device of the embodiment of the present invention includes a connecting rod 10 and a balance hook 20. The balance hook 20 is rotatably arranged relative to the connecting rod 10, the balance hook 20 has at least two support ends, the balance hook 20 has a first position and a second position, when the balance hook 20 is located at the first position, the balance hook 20 can penetrate through the shaft seal packing group 60 so that the shaft seal packing group 60 is sleeved on the periphery of the connecting rod 10; when the balance hook 20 is in the second position, at least two support ends of the balance hook 20 are in abutting contact with the shaft seal packing set 60.

Among the above-mentioned technical scheme, when needing to dismantle the shaft seal packing group 60 in the valve body of valve, because two at least support ends are in the contact of circumference direction with the butt of shaft seal packing group 60 to can provide even effort for shaft seal packing group 60, at the in-process that promotes connecting rod 10, shaft seal packing group 60 can be along the axial of valve body rising, difficult appear in the correlation technique because the shaft seal packing group 60 inclines the card pause phenomenon that causes, thereby improved the efficiency of taking out shaft seal packing group 60.

Specifically, in the embodiment of the present invention, the balance hook 20 has two support ends, and when the balance hook 20 is in the second position, the two support ends of the balance hook 20 are in abutting contact with the shaft seal packing group 60.

As shown in fig. 4, in the embodiment of the present invention, the dismounting device further includes a pivot shaft 30, and the balance hook 20 is pivotally connected to the connecting rod 10 through the pivot shaft 30.

According to the arrangement, the balance hook 20 is rotatably arranged relative to the connecting rod 10 and can be switched between the first position and the second position under the action of external force, so that the subsequent step of disassembling the shaft seal packing set 60 is facilitated.

Specifically, in the embodiment of the present invention, the pivot shaft 30 is a pin, the balance hook 20 is pivotally connected to the connecting rod 10 by the pin, and the balance hook 20 is switched between the first position and the second position around the pin. The above-described manner of rotating the balancing hook 20 around the connecting rod 10 using the pin has a simple structure and is convenient to operate. It should be noted that the pivot shaft 30 is provided so that the balance hook 20 can rotate relative to the link lever 10, but does not fall off the link lever 10.

Of course, in alternative embodiments not shown in the drawings, the pivot shaft 30 may be provided as a screw, a bolt, or a rivet.

As shown in fig. 5 and 6, in the embodiment of the present invention, the balance hook 20 can be switched between the first position and the second position by an external force.

According to the above arrangement, the balance hook 20 can rotate around the pivot shaft 30 relative to the connecting rod 10, the balance hook 20 can rotate from the first position to the third position under the action of gravity, and the balance hook 20 can rotate from the third position to the second position under the action of external force (such as pulling force exerted on the connecting rod 10), so as to facilitate the subsequent step of disassembling the shaft seal packing group 60.

It should be noted that the third position refers to a position where the balance hook 20 is rotated to a position where it cannot pass through the inner hole of the shaft seal packing set 60 again, that is, when the balance hook 20 is in the third position, a distance L3 (shown in fig. 7) between the first end 211 and the second end 212 of the balance hook 20 along a direction perpendicular to the central axis of the shaft seal packing set 60 is greater than the inner diameter of the shaft seal packing set 60.

Specifically, under the action of an external force, the balance hook 20 rotates to a first position around the pivot shaft 30, and when the end of the connecting rod 10 provided with the balance hook 20 extends into the hole of the shaft seal packing group 60 and moves along the axial direction of the shaft seal packing group 60, the inner wall of the shaft seal packing group 60 is in abutting contact with the balance hook 20, so that the balance hook 20 is always kept at the first position until the end of the connecting rod 10 provided with the balance hook 20 penetrates through the shaft seal packing group 60; after the balance hook 20 penetrates through the shaft seal packing group 60, under the action of self gravity, the balance hook 20 rotates to a third position around the pivot shaft 30, at the moment, the maximum outline size of the appearance of the balance hook 20 is larger than the aperture of the inner hole of the shaft seal packing group 60, and thus, the balance hook 20 cannot pass through the inner hole of the shaft seal packing group 60; the balance hook 20 is pulled along the axial direction of the connecting rod 10, one supporting end of the balance hook 20 is in abutting contact with the end surface of the shaft seal packing group 60, and under the action of an external force (for example, the connecting rod 10 can be pulled manually), the other supporting end of the balance hook 20 rotates around the pivot shaft 30 to be in abutting contact with the end surface of the shaft seal packing group 60, and at this time, the balance hook 20 is in the second position. Finally, the connecting rod 10 is pulled, and under the pulling force of the connecting rod 10, the balance hook 20 and the shaft seal packing group 60 (as shown in fig. 6) abutting against the upper side of the balance hook 20 can be quickly pulled to the outside of the valve body, so that subsequent maintenance or replacement of the shaft seal packing group 60 is facilitated.

It should be noted that the power mechanism including the nut 40 and the pressing member 50 may be used to pull the connecting rod 10, or the connecting rod 10 may be pulled by manpower, and the embodiment of the present invention is not limited to the specific structure of the power mechanism, and any method that can pull the connecting rod 10 is within the scope of the present invention.

As shown in fig. 3, in the embodiment of the present invention, the detaching device further includes a limiting structure disposed on the connecting rod 10, and the limiting structure is used for limiting the rotation angle of the balance hook 20.

The limiting structure can limit the rotation angle of the balance hook 20 around the pivot shaft 30, the balance hook 20 is guaranteed to be located at the first position, the maximum outline size of the appearance of the balance hook 20 is smaller than the aperture of the inner hole of the shaft seal packing group 60, and therefore the balance hook 20 can penetrate through the shaft seal packing group 60, the shaft seal packing group 60 is sleeved on the periphery of the connecting rod 10, the balance hook 20 is located at the bottom of the shaft seal packing group 60, and the subsequent step of detaching the shaft seal packing group 60 is facilitated.

Specifically, as shown in fig. 3, the limiting structure is a groove 11 formed in the connecting rod 10, two side surfaces of the groove 11 are symmetrically arranged along the axis of the connecting rod 10, and a bottom surface 112 of the groove 11 can limit a rotation angle of the balance hook 20 relative to the connecting rod 10, so that the balance hook 20 is located at the first position, and thus the balance hook 20 can be ensured to smoothly penetrate through the shaft seal packing group 60, and further, the subsequent work of detaching the shaft seal packing group 60 is ensured to be performed quickly and smoothly, and the detaching efficiency is improved.

As shown in fig. 2 to 4, in the embodiment of the present invention, the balance hook 20 includes a hook body 21 and a protrusion 22 connected to the hook body 21, an axis L1 of the protrusion 22 coincides with a central axis L2 (see fig. 2 in particular) of the connecting rod 10, and the first end 211 and the second end 212 of the hook body 21, which are oppositely disposed, form two support ends.

According to the above arrangement, when the balance hook 20 is pulled up by the connecting rod 10 under the action of external force, the central axis L2 of the connecting rod 10 can be ensured to coincide with the axis L1 of the protrusion 22 without deflection, so that the shaft seal packing group 60 can be ensured to move along the axis direction of the connecting rod 10, the phenomenon of blocking caused by the inclination of the shaft seal packing group 60 is avoided, and the efficiency of taking out the shaft seal packing group 60 is improved. The two supporting ends of the hook body 21 are supported at the bottom of the shaft seal packing group 60, so that the bottom of the shaft seal packing group 60 is uniformly stressed, the bottom of the shaft seal packing group 60 is prevented from being damaged due to uneven stress, on one hand, the phenomenon of blocking and stopping caused by the inclination of the shaft seal packing group 60 is avoided, the shaft seal packing group 60 is ensured to be taken out smoothly, and the efficiency of disassembling the shaft seal packing group is improved; on the other hand, the shaft seal packing group 60 is ensured to be completely taken out of the valve body, and the problem that the shaft seal packing group is difficult to take out due to damage and falling inside the valve body is avoided.

As shown in fig. 2 and 4, in the embodiment of the present invention, the protrusion 22 is arc-shaped, and the length L of the protrusion 22 is less than or equal to the inner diameter of the shaft seal packing set 60.

According to the arrangement, when the first end 211 of the hook body 21 is supported at the bottom of the shaft seal packing group 60, the arc-shaped protrusion 22 is matched and guided with the inner wall surface of the sealing member at the bottom of the shaft seal packing group 60, so that the axis L1 of the protrusion 22 is coincided with the axis of the shaft seal packing group 60, and thus the second end 212 of the hook body 21 is supported at the bottom of the shaft seal packing group 60, at this time, because the axis L1 of the protrusion 22, the axis of the shaft seal packing group 60 and the central axis L2 of the connecting rod 10 are coincided, it is ensured that the shaft seal packing group 60 is not deflected or jammed during the process of disassembling and taking out the shaft seal packing group 60, and the efficiency of disassembling the shaft seal packing group 60 is.

Specifically, in the embodiment of the present invention, the balance hook 20 is made of a steel plate with a certain thickness, the hook body 21 is a hexahedron, and the first end 211 and the second end 212 of the hook body 21 are symmetrically disposed with respect to the axis L1 of the protrusion 22. The projection 22 is a semicircular projection, and the projection 22 is provided on the side surface of the hook body 21. According to the illustration in fig. 4, the thickness dimension of the protrusion 22 in the direction parallel to the pivot axis 30 is the same as the thickness dimension of the hook body 21, the length L of the protrusion 22 is less than or equal to the inner diameter dimension of the shaft seal packing set 60, and the axis of the protrusion 22 coincides with the axis of the hook body 21.

Preferably, the balancing hook 20 is made of a steel plate with a thickness of 8mm, and the protrusion 22 is a semicircular protrusion with a radius of 14 mm.

Of course, in an alternative embodiment not shown in the drawings, the shape of the projection 22 may be one of oval, trapezoidal and rectangular, but the length dimension L of the projection 22 is ensured to be less than or equal to the inner diameter of the packing set 60. The thickness of the protrusion 22 and the thickness of the hook body 21 may be different, but both are ensured to be smaller than the width of the groove 11. The axes of the protrusion 22 and the hook body 21 may not coincide, but it is sufficient to ensure that the first end 211 and the second end 212 of the hook body 21 can clamp the lower end of the shaft seal packing set 60 to support the shaft seal packing set 60.

As shown in fig. 2 and 3, in the embodiment of the present invention, the detaching device further includes a first mounting hole 23 disposed on the protrusion 22 and a second mounting hole 12 disposed on the connecting rod 10, wherein the second mounting hole 12 is communicated with the groove 11 disposed at one end of the connecting rod 10, and the pivot shaft 30 is disposed through the first mounting hole 23 and the second mounting hole 12.

Specifically, in the embodiment of the present invention, the pivot connection between the balance hook 20 and the connecting rod 10 is realized by a pin, the first mounting hole 23 is a through hole formed on the protrusion 22 along the direction of the axis L1 of the protrusion 22, the second mounting hole 12 is a through hole formed on the two side walls 111 of the groove 11, and the pin is inserted into the first mounting hole 23 and the second mounting hole 12.

The present application is not limited to the above arrangement, and in an alternative embodiment not shown in the drawings, the first mounting hole 23 may be arranged at the hook body 21 or the first mounting hole 23 may be arranged at the connection between the hook body 21 and the protrusion 22 according to actual needs. The second mounting hole 12 may be a through hole formed only on one side wall 111 of the recess 11, and a corresponding recess or blind hole is formed on the other side wall 111 of the recess 11.

As shown in fig. 1, in the embodiment of the present invention, the detaching device further includes a nut 40, at least a part of the outer surface of the connecting rod 10 is provided with an external thread, and the nut 40 is engaged with the external thread.

According to the arrangement, the nut 40 is matched with the external thread on the connecting rod 10, so that the rotary motion of the nut 40 can be converted into the linear motion of the connecting rod 10 and the balance hook 20, the shaft seal packing group 60 is driven to be rapidly detached from the valve, and the efficiency of detaching the shaft seal packing group 60 on site is improved.

Specifically, the utility model provides a connecting rod 10 partial surface is equipped with the external screw thread, and external screw thread length should satisfy the stroke requirement of taking out bearing seal packing group 60 to guarantee to pack at the bearing seal and pack 60 and take out the in-process, continuously provide and take out the required lifting force of bearing seal packing group 60, pack group 60 with the smooth bearing seal of taking out of assurance follow valve.

Of course, in the alternative embodiment shown in the figures, the entire outer surface of the connecting rod 10 may be externally threaded as desired.

As shown in fig. 1, in the embodiment of the present invention, the detaching device further includes a pressing member 50, the pressing member 50 has a through hole, and the pressing member 50 is disposed at the periphery of the connecting rod 10.

According to the above arrangement, the pressing piece 50 is fixed on the valve body, the nut 40 moves in cooperation with the external thread of the connecting rod 10, when the nut 40 contacts with the pressing piece 50, the nut 40 is limited by the pressing piece 50, and cannot move along the axial direction of the connecting rod 10, namely cannot move to the left side of fig. 1, if the nut 40 is rotated continuously, under the cooperation of rotary motion, the connecting rod 10 can drive the balance hook 20 to move to the right side of fig. 1 continuously and stably along the axial direction until the shaft seal packing group 60 positioned inside the valve body is completely taken out, and therefore the efficiency of detaching the shaft seal packing group 60 on site is improved.

The method of removing the packing from the valve body by means of the above-described removal device, which ensures that the valve stem of the valve has been completely removed from the valve body before use, will now be described in detail.

The method comprises the following steps: the method of disassembling the shaft seal packing set 60 includes the following steps (refer to fig. 5 and 6):

s10, firstly, horizontally placing the plate surface of the balance hook 20, and then rotating the balance hook 20 to make it at the first position;

s20, the balance hook 20 at the first position and the connecting rod 10 are penetrated and arranged at the bottom of the shaft seal packing group 60;

s30, rotating the connecting rod 10 to make the plate surface of the balance hook 20 vertical to the horizontal plane, and rotating the balance hook 20 to the second position under the action of gravity;

s40, pulling the connecting rod 10 along the central axis L2 direction of the connecting rod 10, so that the balance hook 20 is supported at the bottom of the shaft seal packing group 60;

s50, the pressing member 50 is snapped into the valve such that the position of the pressing member 50 relative to the valve is fixed, the nut 40 is brought into abutting contact with the pressing member 50, and the nut 40 is rotated until the shaft seal packing set 60 is removed from the valve body.

The method 2 comprises the following steps: the method for quickly taking out the valve shaft seal packing group 60 installed at other positions comprises the following steps:

s10, rotating the balance hook 20 to make it at the first position;

s20, penetrating the balance hook 20 at the first position together with the connecting rod 10 into the inner hole of the shaft seal packing group 60, and abutting the balance hook 20 by using the inner wall of the shaft seal packing group 60 so as to keep the balance hook 20 at the first position;

s30, after the balance hook 20 penetrates through the bottom of the shaft seal packing group 60, rotating the connecting rod 10 to be in a third position;

s30, pulling the connecting rod 10 along the central axis L2 direction of the connecting rod 10 to make the balance hook 20 supported at the bottom of the shaft seal packing group 60, at this time, the balance hook 20 is located at the second position;

s40, the pressing piece 50 is clamped into the valve, the nut 40 is abutted to the pressing piece 50, and the nut 40 is rotated until the shaft seal packing group 60 is taken out of the valve body.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the balance hook rotates to a first position and a second position which are required for taking out the shaft seal packing group through the rotation of the balance hook around the middle pivot, and when the balance hook rotates to the first position, the balance hook can penetrate through the shaft seal packing group to enable the shaft seal packing group to be sleeved on the periphery of the connecting rod; when the balance hook is at the second position, the two supporting ends of the balance hook are in abutting contact with the shaft seal packing group so as to enable the balance hook to be stressed in a balanced manner. Therefore, the phenomenon of blocking during the process of taking out the shaft seal packing group can be effectively prevented, the shaft seal packing group can be rapidly taken out from the valve body, and the efficiency of disassembling the shaft seal packing group on site is improved.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A dismounting device for a packing set of a shaft seal, said dismounting device comprising:

a connecting rod (10);

the balance hook (20) is rotatably arranged relative to the connecting rod (10), the balance hook (20) is provided with at least two supporting ends, the balance hook (20) is provided with a first position and a second position, and when the balance hook (20) is located at the first position, the balance hook (20) can penetrate through the shaft seal packing group (60) so that the shaft seal packing group (60) can be sleeved on the periphery of the connecting rod (10); when the balance hook (20) is in the second position, the at least two support ends of the balance hook (20) are in abutting contact with the shaft seal packing set (60).

2. Dismounting device according to claim 1, characterized in that it further comprises a pivot shaft (30), said balancing hook (20) being pivotally connected with said connecting rod (10) by said pivot shaft (30).

3. Dismounting device according to claim 1, characterized in that the balancing hook (20) can be switched between the first and second position under the influence of an external force.

4. The dismounting device according to claim 1, characterized in that it further comprises a limiting structure provided on the connecting rod (10) for limiting the angle of rotation of the balancing hook (20).

5. Dismounting device according to claim 4, characterized in that said limiting structure is a groove (11) provided at one end of the connecting rod (10).

6. Dismounting device according to any one of claims 1 to 5, characterized in that the balancing hook (20) comprises a hook body (21) and a protrusion (22) connected to the hook body (21), the axis L1 of the protrusion (22) coinciding with the central axis L2 of the connecting rod (10), the first (211) and second (212) oppositely arranged ends of the hook body (21) forming the two support ends.

7. The dismounting device according to claim 6, wherein the protrusion (22) is arc-shaped, and the length L of the protrusion (22) is less than or equal to the inner diameter dimension of the shaft seal packing set (60).

8. The dismounting device according to claim 7, characterized in that it further comprises a pivot shaft (30), a first mounting hole (23) provided on said protrusion (22) and a second mounting hole (12) provided on said connecting rod (10), wherein said second mounting hole (12) communicates with a groove (11) provided at one end of said connecting rod (10), said pivot shaft (30) being inserted in said first mounting hole (23) and said second mounting hole (12).

9. The dismounting device according to any one of claims 1 to 5, characterized in that it further comprises a nut (40), at least part of the outer surface of the connecting rod (10) being provided with an external thread, said nut (40) cooperating with said external thread.

10. Dismounting device according to claim 9, characterized in that it further comprises a pressing piece (50), said pressing piece (50) having a through hole, said pressing piece (50) being arranged at the periphery of said connecting rod (10).

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