CN215847912U

CN215847912U - Screwing tool

Info

Publication number: CN215847912U
Application number: CN202120502173.9U
Authority: CN
Inventors: 孙磊; 欧阳醌; 郑思凯; 张潇
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2022-02-18
Anticipated expiration: 2031-03-09

Abstract

The utility model provides a screwing tool which comprises a torque reversing device and a first fastener, wherein the torque reversing device is used for providing a torque reversing force for the screwing device, the screwing device is used for screwing a gland nut of a turbine rotor assembly, the torque reversing device comprises an annular supporting disk and a plurality of first fasteners, the supporting disk is sleeved outside a turbine shaft of the turbine rotor assembly, the supporting disk is circumferentially provided with a plurality of through holes which are in one-to-one correspondence with a plurality of mortises of the turbine disk of the turbine rotor assembly, the extending direction of each through hole is consistent with the extending direction of the corresponding mortises, and each first fastener penetrates through the corresponding through hole and is inserted into the corresponding mortises, so that the supporting disk is circumferentially stopped rotating relative to the turbine disk. The screwing tool can be used for conveniently realizing reverse twisting in the state of the whole machine.

Description

Screwing tool

Technical Field

The utility model relates to a screwing tool.

Background

The assembly technology of the aircraft engine involves the installation/disassembly of a large number of special nuts with complex structures, for example, the rear end of a turbine shaft of a high-pressure turbine rotor assembly is provided with a compression nut aiming at a turbine disc, and the requirements on torque, protective threads and the like during the screwing or unscrewing of the nuts are very strict, so that a special device needs to be designed for operation. In the traditional installation method for the turbine rotor assembly, the rotor assembly is fixed on an assembly seat in a rotor unit state, and the assembly seat is used for reversely twisting to realize the installation/disassembly of the compression nut. In the process of engine troubleshooting, the assembly/disassembly of the engine is usually performed not according to the module disassembly of the maintenance unit body, but on the part level of a certain maintenance unit body in the state of the complete machine. For example, the tightening torque of a compression nut of an engine of a certain model reaches 5000N · m, the rotor assembly cannot be limited in the circumferential direction in the complete machine state, and how to overcome space limitation, realize anti-twisting and achieve the torque requirement of the nut.

Therefore, it is necessary to provide a screwing tool capable of realizing anti-twisting in a complete machine state.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a screwing tool which is convenient for realizing reverse twisting in a complete machine state.

The utility model provides a screwing tool which comprises a torque reversing device and a first fastening piece, wherein the torque reversing device is used for providing a torque reversing force for the screwing device, the screwing device is used for screwing a gland nut of a turbine rotor assembly, the torque reversing device comprises an annular supporting disc and a plurality of first fastening pieces, the supporting disc is sleeved outside a turbine shaft of the turbine rotor assembly, the supporting disc is circumferentially provided with a plurality of through holes which are in one-to-one correspondence with a plurality of mortises of a turbine disc of the turbine rotor assembly, the extending direction of each through hole is consistent with the extending direction of the corresponding mortises, and each first fastening piece penetrates through the corresponding through hole and is inserted into the corresponding mortises, so that the supporting disc is prevented from rotating relative to the turbine disc in the circumferential direction.

In one embodiment, the anti-twisting device further comprises a protective sleeve, the protective sleeve extends along the extending direction of the mortise and is clamped in the mortise, and the first fastening piece is inserted into a cylindrical hole of the protective sleeve.

In one embodiment, the support disk has an inner peripheral edge portion and an outer peripheral edge portion, the perforations being provided at the outer peripheral edge portion, the support disk being provided with through holes at the inner peripheral edge portion; the anti-twisting device further comprises an axial limiting assembly, the axial limiting assembly comprises a second fastener and an axial limiting part, the second fastener penetrates through the through hole to be connected with the axial limiting part, and the axial limiting part and the inner peripheral part are respectively clamped from two sides in the axial direction to form a flange edge protruding towards the radial inner side of the turbine disc.

In one embodiment, the anti-twisting device further comprises: the lower end of the strut is connected with the upper disc surface of the turbine disc; and the upper end of the strut is connected with the lower plate surface of the anti-torsion plate, and the anti-torsion plate is used for providing a reaction torque for the screwing device.

In one embodiment, the screwing device comprises a torque multiplier; the anti-twist plate has a middle hole through which a torque output end of the torque multiplier outputs a screwing torque to the compression nut, and a slot provided at a periphery of the middle hole into which an anti-twist fixing post of the torque multiplier is inserted, whereby the anti-twist plate provides a reaction torque to the torque multiplier.

In one embodiment, the screwing tool further comprises a screwing limiting assembly, the screwing limiting assembly comprises an axial pressing piece, the axial pressing piece is provided with a column body and a pressing flange protruding outwards from the column body, the lower end of the column body is detachably connected with the anti-twisting plate, and the pressing flange presses the cylinder body of the torque multiplier from the upper side against the anti-twisting plate.

In one embodiment, the screw limiting assembly further comprises a positioning plate supported above the anti-torsion plate by a post; the upper end of the column body of the axial pressing piece is detachably connected with the positioning support plate.

In one embodiment, the cylinder of the axial compression member is a stud, the lower end of the stud is in threaded connection with the anti-torsion plate, and the upper end of the stud penetrates through the positioning support plate and is connected with a nut.

In one embodiment, the screwing tool further comprises a hanging ring for connecting a lifting appliance.

In one embodiment, the screwing tool comprises the screwing device; the screwing device comprises a torque multiplier and an adapter cylinder, the upper end of the adapter cylinder is matched with the torque output end of the torque multiplier, and the lower end of the adapter cylinder outputs screwing torque to the compression nut.

In the screwing tool, the anti-twisting device is stopped by utilizing the tongue-and-groove of the turbine disc, so that the anti-twisting torque is provided, the compression nut can be screwed or loosened under the condition that the turbine rotor assembly is not limited in the circumferential direction, the anti-twisting can be conveniently realized under the complete machine state, and the compression nut can be assembled or disassembled.

The screwing tool further comprises a protective sleeve clamped in the mortise, so that the mortise can be protected from being damaged, and parts can be prevented from being damaged in the screwing or unscrewing process when the screwing torque of the compression nut is high in requirement.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

fig. 1 is a front view of an exemplary screw tool according to the present invention.

FIG. 2 is a top view of an exemplary twist tooling.

FIG. 3 is a cross-sectional view of an exemplary twist tooling.

FIG. 4 is a top view of an exemplary anti-torque device.

Fig. 5 is a cross-sectional view of the anti-twist device taken along the line C-C in fig. 4.

FIG. 6 is a schematic view showing the connection of the axial stop assembly to the turbine disk.

Fig. 7 is a schematic view of an exemplary protective sleeve.

Detailed Description

The present invention will be further described with reference to the following detailed description and the accompanying drawings, wherein the following description sets forth further details for the purpose of providing a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms other than those described herein, and it will be readily apparent to those skilled in the art that the present invention may be embodied in many different forms without departing from the spirit or scope of the utility model.

For example, a first feature described later in the specification may be formed over or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

As shown in fig. 1 to 3, the screwing tool 10 includes a torque reverser 1. The anti-torque device 1 is used to provide a reaction torque to the screwing device 30, and the screwing device 30 is used to screw a gland nut 201 (shown in fig. 3) of the turbine rotor assembly 20. In the illustrated embodiment, the screwing device 30 may also be part of the screwing tool 10, i.e., the screwing tool 10 may include the screwing device 30. Although the illustrated embodiment is exemplified by screwing, the screwing operation may be an unscrewing operation. It is to be understood that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the utility model, for which reference should be made to the appended claims.

The turbine rotor assembly 20 includes a turbine shaft 202 (shown in fig. 3), a turbine disc 203, and a gland nut 201, wherein the gland nut 201 is mounted on a rear shaft end (upper end in fig. 1) of the turbine shaft 202, and the turbine disc 203 is located on a front shaft end (lower end in fig. 1) of the turbine shaft 202. The turbine disk 203 has a plurality of tongue-and-grooves 204 uniformly distributed along the circumferential direction C0 on the outer circumferential edge. A high pressure turbine rotor assembly is shown as an example of turbine rotor assembly 20. Referring to fig. 6, the upper disc surface 203a of the turbine disc 203 of the type shown therein is further provided with a flange edge 203b projecting toward the radially inner side, with a notch being formed between the flange edge 203b and the upper disc surface 203 a.

The anti-torque device 1 comprises an annular support disc 2 and a plurality of first fastening members 3. An example configuration of an annular support disc 2 can be seen in fig. 4, the support disc 2 can be, for example, an annular plate shape having an annular hole 21.

The support disc 2 is sleeved outside the turbine shaft 202 of the turbine rotor assembly 20. That is, the aperture size of the annular hole 21 of the support disk 2 is larger than the outer diameter size of the turbine shaft 202, and the support disk 2 is sleeved outside the turbine shaft 202 through the annular hole 21.

The support disk 2 is provided with a plurality of perforations 91 in the circumferential direction C0 in one-to-one correspondence with the plurality of mortises 204 of the turbine disk 203. It is understood that the plurality of slots 204 corresponding to the plurality of perforations 91 may be a portion, but not all, of all of the slots 204 of the turbine disk 203. For example, in the embodiment shown in fig. 4, the support disk 2 is collectively provided with a plurality of perforations 91 uniformly distributed in the circumferential direction C0 in two portions (in fig. 4, an upper portion and a lower portion), respectively. It is understood that the plurality of perforations 91 provided in the circumferential direction C0 of the support disc 2 may also be arranged at unequal intervals.

Each first fastener 3 is inserted into the corresponding mortise 204 through the corresponding through hole 91 so that the support disk 2 is locked with respect to the turbine disk 203 in the circumferential direction C0. The first fastening member 3 may be a screw or a bolt, and the through hole 91 may be a screw hole. The first fastening means 3 can also be a stop pin with a pin and a stop flange projecting outwards from the pin, the pin of the stop pin being inserted through the through hole 91 into the groove 204, the stop flange of the stop pin resting on the upper surface 24 of the support disk 2, so that a circumferential rotation stop of the support disk 2 relative to the turbine disk 203 can also be achieved.

In the screwing tool 10, the first fastening member 3 is inserted into the mortise 204 of the turbine disc 203, and when the gland nut 201 is screwed, the first fastening member can be clamped on the tenon teeth of the turbine disc 203 to provide anti-torque, so that the anti-torque moment can be provided to the screwing device 30 by using the self-structure of the turbine rotor assembly 20, and therefore, the gland nut 201 can be screwed or loosened without circumferential limitation of the turbine rotor assembly 20, and the whole screwing tool 10 is reduced in size at least in the radial direction, so that the whole screwing tool 10 can be more compact, and space limitation can be easily overcome.

In the illustrated embodiment, the anti-twist device 1 may further comprise a protective sleeve 4. The protective sleeve 4 may be, for example, a protective copper sleeve, and an example configuration may be seen in fig. 7. The protection sleeve 4 may extend along the extending direction of the mortise 204 and be caught in the mortise 204, as shown in fig. 1. The first fastening member 3 is inserted into the cylindrical hole 41 of the protection sleeve 4. The protective sleeve 4 is placed in the mortise 204 of the turbine disk 203 to sleeve the pin 31 of the first fastening member 3, in other words, the protective sleeve 4 is disposed between the pin 31 and the mortise 204 of the first fastening member 3 of the torque reverser 1 to protect the tenon teeth during the screwing operation, so that the turbine disk 203 is not damaged during the screwing operation. In another embodiment, the protection sleeve 4 may be made of other materials such as rubber, and may also play a role of protection. In yet another embodiment, the outer cylindrical surface of the pin 31 of the first fastening member 3 may be coated with a protective layer to protect the turbine disk 203.

Referring to fig. 4, the support disc 2 has an inner peripheral edge portion 22 and an outer peripheral edge portion 23. In the illustrated embodiment, the perforations 91 may be provided in the outer peripheral edge 23 of the support disc 2. In the illustrated embodiment, the support plate 2 may be provided with a through hole 92 in the inner peripheral edge portion 22. The anti-torque device 1 may further comprise an axial stop assembly 5, as shown in fig. 5. The axial stop assembly 5 may include a second fastener 51 and an axial stop 52. The second fastening member 51 may be, for example, a screw, a bolt, or the like. The axial stop 52 may be, for example, a plate, as shown in fig. 5. The second fastening member 51 may be connected to the axial stopper 52 through the through hole 92, so that the axial stopper 52 and the inner peripheral edge portion 22 of the support disk 2 clamp the flange 203b of the turbine disk 203 projecting toward the radially inner side from both sides (from the lower side and the upper side, respectively, in fig. 1) in the axial direction X0, as can be seen in fig. 6. In other words, the axial stop 52 projecting below the aforementioned flanged edge 203b of the turbine disc 203 is mounted to the support disc 2 by means of the second fastening member 51. The axial stop assembly 5 may provide axial stop for the anti-torque device 1.

It is understood that specific terms are used herein to describe embodiments of the utility model, such as "one embodiment," "an embodiment," and/or "some embodiments" mean a particular feature, structure, or characteristic described in connection with at least one embodiment of the utility model. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" in various places throughout this specification are not necessarily to the same embodiment. Furthermore, some of the features, structures, or characteristics of one or more embodiments of the present invention may be combined as suitable. In addition, the terms "first", "second", and the like are used to define the components, and are used only for convenience of distinguishing the corresponding components, and the terms do not have special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

In the illustrated embodiment, the anti-twist device 1 may further include a stay 61 and an anti-twist plate 62. The lower end of the strut 61 is connected to the upper disc surface 203a of the turbine disc 203, for example, by a screw 611. The upper end of the strut 61 is connected to the lower plate surface of the anti-twist plate 62. That is, the strut 61 supports the anti-torsion plate 62 above the support disc 2. Further, the anti-torque device 1 may comprise at least two struts 61 distributed at the periphery of the turbine shaft 202. In this way, a portion that provides the reaction torque to the screwing device 30 can be located at the rear end of the turbine shaft 202, and it is possible to facilitate access to the mounting portion of the screwing device 30.

In the illustrated embodiment, the screwing device 30 may comprise a torque multiplier 301. It will be appreciated that the torque multiplier 301 has a barrel 303, a torque output end 304 and a torque reaction mounting post 305, etc., wherein the torque output end 304 is for outputting torque, typically provided with torque transmissible splines, and the torque reaction mounting post 305 is fixed or restrained to provide torque reaction.

In the illustrated embodiment, the screwing device 30 may further include an adapter barrel 302. The upper end of the adapter 302 is matched with the torque output end 304 of the torque multiplier 301, and the lower end outputs screwing torque to the compression nut 201. In the illustrated embodiment, the adapter barrel 302 is further divided into a rear adapter section 302a (the upper adapter barrel section in fig. 3) and a front adapter section 302b (the lower adapter barrel section in fig. 3). The upper end of the rear adapter section 302a can be matched with the spline of the torque output end 304 of the torque multiplier 301, the lower end is connected with the upper end of the front adapter section 302b, and the lower end of the front adapter section 302b is in transmission connection with the gland nut 201 to drive the front adapter section 302b to screw the gland nut 201.

In the illustrated embodiment, the anti-torque plate 62 may have a central hole 621, and the torque output end 304 of the torque multiplier 301 may output a screwing torque to the compression nut 201 via the central hole 621. The anti-torque plate 62 may also have a slot 622 disposed at the periphery of the central aperture 621, and the anti-torque anchor 305 of the torque multiplier 301 may be inserted into the slot 622, whereby the anti-torque plate 62 may provide a reaction torque to the torque multiplier 301.

In the illustrated embodiment, the screw tool 10 may further include a screw stopper assembly 7. The screw stop assembly 7 may comprise an axial compression member 71. The axial compression member 71 may have a cylinder 710 and a compression flange 711 projecting outwardly from the cylinder 710. The lower end of the post 710 may be removably connected to the anti-torque plate 62, such as by a threaded connection. The pressing flange 711 can press the barrel 303 of the torque multiplier 301 from the upper side against the anti-twist plate 62. Thus, the torque multiplier 301 may be mounted axially captively on the anti-torque plate 62. To this end, the anti-twist plate 62 is not only fixed above the support disc 2 by the strut 61, providing anti-twist during operation of the torque multiplier 301, but also supporting and fixing the torque multiplier 301.

In the illustrated embodiment, the screw stop assembly 7 may further include a positioning support plate 72, and the positioning support plate 72 is supported above the anti-torsion plate 62 by a post 73. The upper end of the column 710 of the axial compression member 71 can be detachably connected with the positioning support plate 72. In this way, the axial limit of the torque multiplier 301 is more reliable. In the illustrated embodiment, the column 710 of the axial compression member 71 may be a stud, the lower end of the stud may be screwed to the anti-torsion plate 62, and the upper end of the stud may penetrate the positioning support plate 72 to be connected to the nut 74, so that the compression force of the compression flange 711 on the barrel 303 of the torque multiplier 301 can be adjusted by screwing the nut 74. The stud bolts (as part of the axial compression member 71) coupled to the alignment brackets 72 and the anti-twist plate 62 provide axial alignment of the torque multiplier 301. The post 73 can be mounted to the anti-torque plate 62 to support the fixed positioning support plate 72 to prevent rotation of the torque wrench when tightened or loosened, and to act as an anti-torque support.

In the illustrated embodiment, the screwing tool 10 may further include a hanging ring 8 for connecting a hanger. In fig. 3, the lifting ring 8 can be fixed to the positioning plate 72, and a lifting device, such as the screw device 30, can be connected to the lifting screw tool 10 in whole or in part.

In the screwing tool 10, the support column 61 is fixed to the support disc 2, and connects and supports the anti-torsion plate 62, the axial pressing piece 71, the positioning support plate 72, the upright column 73 and the like. The anti-twisting device is additionally arranged at the mortise of the turbine disc of the screwing tool, and the torque requirement of the compression nut is met by stopping the turbine rotor assembly. Meanwhile, the protective sleeve is additionally arranged in the mortise by the screwing tool, so that the mortise is protected from being damaged. The screwing tool is simple in structure and convenient to operate, the compression nut can be screwed or unscrewed in the complete machine state, the strength of the blade mortise can meet the requirement of large torque, and meanwhile, the protective sleeve is added, so that the mortise is not easy to damage. In addition, the screwing tool can be connected with the anti-twisting plate and the positioning support plate through the stud bolts, so that the axial limiting of the torque multiplier is ensured, the axial float cannot occur in the screwing process, and the safety in large-torque screwing is ensured.

An exemplary operation will be described below by taking the screwing tool 10 as an example. The protective sleeves 4 are placed into the mortises 204 of the turbine disc 203, one protective sleeve 4 being placed in each mortice 204. The support disk 2 is placed on the turbine disk 203, the perforations 91 are aligned with the protective sleeve 4, the axial stop 52 is installed and secured using the second fastener 51. The first fastening members 3 are mounted on the supporting plate 3-2 and sleeved in the protective sleeves 4, and the first fastening members 3 and the protective sleeves 4 correspond one to one. The mounting post 61 is attached to the support plate 2 and secured with fasteners 611. The adapter 302 in the turning device 30 is placed onto the turbine rotor assembly 20 and slipped onto the gland nut 201. The anti-torsion plate 62 and the pillar 73 are attached to the pillar 61, for example, by screws. The torque multiplier 301 is mounted on the anti-twist plate 62, the splines of the torque output end 304 of the torque multiplier 301 are aligned with the splines of the rear adaptor section 302a, and the anti-twist fixing posts 305 of the torque multiplier 301 are inserted into the slots 622 of the anti-twist plate 62. The axial compression member 71 and the positioning brackets 72 are mounted such that the compression flange 712 of the axial compression member 71 compresses the torque multiplier 301 to provide axial retention. Torque multiplier 301 is tightened using a torque wrench to tighten or loosen compression nut 201 to the desired torque.

The screwing tool can screw the compression nut in the state of the complete machine, for example, the compression nut is disassembled, convenience is provided for disassembling and reassembling the engine fault, the disassembly to the maintenance unit body is not needed, and then the component-level disassembly is carried out, so that the fault elimination period is shortened. Moreover, the screwing tool is simple in structure and convenient to operate, the protection is added to the part, and the part is protected from being damaged by large torque.

Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the utility model, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims

1. A screwing tool comprises a torque reversing device for providing a torque to the screwing device, the screwing device is used for screwing a gland nut of a turbine rotor component, and the screwing tool is characterized in that,

the anti-twist device includes:

the supporting disc is sleeved outside a turbine shaft of the turbine rotor assembly, a plurality of through holes which correspond to the plurality of mortises of the turbine disc of the turbine rotor assembly one to one are circumferentially arranged on the supporting disc, and the extending direction of each through hole is consistent with the extending direction of the corresponding mortice; and

a plurality of first fasteners, each first fastener inserted through a corresponding aperture into a corresponding mortise such that the support disk is circumferentially stopped relative to the turbine disk.

2. The screwing tool according to claim 1,

the anti-twisting device further comprises a protective sleeve, the protective sleeve extends along the extending direction of the mortise and is clamped in the mortise, and the first fastening piece is inserted into a sleeve hole of the protective sleeve.

3. The screwing tool according to claim 1,

the support plate is provided with an inner peripheral edge part and an outer peripheral edge part, the perforation is arranged on the outer peripheral edge part, and the support plate is provided with a through hole on the inner peripheral edge part;

the anti-twist device still includes the spacing subassembly of axial, the spacing subassembly of axial includes:

a second fastener; and

and the second fastener penetrates through the through hole to be connected with the axial limiting part, so that the axial limiting part and the inner peripheral part are respectively clamped with the flange edge, protruding towards the radial inner side, of the turbine disc from two sides in the axial direction.

4. The screwing tool according to claim 1,

the anti-twist device further comprises:

the lower end of the strut is connected with the upper disc surface of the turbine disc; and

the upper end of the strut is connected with the lower plate surface of the anti-torsion plate, and the anti-torsion plate is used for providing a reaction torque for the screwing device.

5. The screwing tool according to claim 4,

the screwing device comprises a torque multiplier;

the anti-twist plate has a middle hole through which a torque output end of the torque multiplier outputs a screwing torque to the compression nut, and a slot provided at a periphery of the middle hole into which an anti-twist fixing post of the torque multiplier is inserted, whereby the anti-twist plate provides a reaction torque to the torque multiplier.

6. The screwing tool according to claim 5,

the screwing tool further comprises a screwing limiting assembly, the screwing limiting assembly comprises an axial pressing piece, the axial pressing piece is provided with a cylinder and a pressing flange protruding outwards from the cylinder, the lower end of the cylinder is detachably connected with the anti-twisting plate, and the pressing flange abuts against the anti-twisting plate to press the cylinder body of the torque multiplier from the upper side.

7. The screwing tool according to claim 6, wherein the screwing limiting assembly further comprises a positioning support plate supported above the anti-twisting plate through an upright;

the upper end of the column body of the axial pressing piece is detachably connected with the positioning support plate.

8. The screwing tool according to claim 7,

the cylinder that the axial compresses tightly the piece adopts stud, stud's lower extreme with anti-torsion plate threaded connection, stud's upper end is worn out the location extension board and is connected with the nut.

9. The screwing tool according to claim 1,

the screwing tool further comprises a hanging ring for connecting a lifting appliance.

10. The screwing tool according to claim 1,

the screwing tool comprises the screwing device;

the screwing device comprises a torque multiplier and an adapter cylinder, the upper end of the adapter cylinder is matched with the torque output end of the torque multiplier, and the lower end of the adapter cylinder outputs screwing torque to the compression nut.