CN219444912U - Sleeve quick-changing device and sleeve mechanism - Google Patents

Abstract

The utility model relates to a sleeve device, in particular to a sleeve quick-change device, which comprises a lifting mechanism, a first clamping mechanism and a second clamping mechanism, wherein the lifting mechanism is used for being inserted into the lower end of a sleeve to be supported, the first clamping mechanism is fixed on the lifting mechanism and used for clamping the sleeve, the second clamping mechanism is used for clamping a movable clamping ring of the sleeve mechanism and is fixed on a device shell, the lifting mechanism comprises a lifting seat and a lifting driving mechanism, the lifting seat is accommodated in the device shell, and the lifting seat can be lifted or lowered under the driving of the lifting driving mechanism, so that the upper end of a lengthened sleeve can be driven to be in butt joint or separation with the lower end of the sleeve mechanism. The utility model also discloses a sleeve mechanism matched with the sleeve quick-changing device. The sleeve quick-changing device can automatically change the sleeve, thereby improving the production operation efficiency.

Description

Sleeve quick-changing device and sleeve mechanism

Technical Field

The utility model relates to a sleeve device, in particular to a sleeve quick-changing device. In addition, the utility model also relates to a sleeve mechanism matched with the sleeve quick-changing device.

Background

In the assembly of nuts or bolts, a socket is usually used for fastening or disassembling the nuts, so called a socket wrench, which is a tool for screwing bolts, screws or nuts by utilizing the lever principle, and an inner hexagonal groove or an inner sixteen angle groove is usually formed at the end of the socket, so that the socket can be sleeved into the bolts or nuts and can be installed or disassembled, and the socket is particularly suitable for the occasion with very narrow screwing positions or bolts or nuts at a very deep recess.

In order to meet the needs of the public, the specifications of the sleeves are various, and the conventional sleeves are lengthened, so that a plurality of relatively tight fasteners can be detached by lengthening the moment arm or increasing the moment. The sleeve is typically mounted at the end of the tightening tool and may be used with a extension rod, handle, etc., and more typically, the sleeve may be mounted on an electric drill for use. Because the specifications of the sleeve used in different situations, such as the size and shape of the sleeve, often need to be selected for different devices, the sleeve often needs to be replaced to meet different requirements in different situations.

In the prior art, the sleeve is replaced by manual replacement, however, the sleeve is troublesome to replace a larger sleeve, the error rate of the sleeve is high in frequent manual replacement, and the production operation efficiency is easy to be reduced.

In view of the foregoing, it is desirable to provide a quick sleeve replacing device to solve or overcome the above-mentioned problems.

Disclosure of Invention

The utility model solves the technical problem of providing the sleeve quick-change device which can automatically change the sleeve, thereby improving the production efficiency.

Another aspect of the present utility model provides a sleeve mechanism that can be used in combination with a sleeve quick-change device, thereby improving production efficiency.

In order to solve the technical problems, the utility model provides a sleeve quick-change device, which comprises a lifting mechanism, a first clamping mechanism and a second clamping mechanism, wherein the lifting mechanism is used for being inserted into the lower end of a sleeve to be supported, the first clamping mechanism is fixed on the lifting mechanism and used for clamping the sleeve, the second clamping mechanism is used for clamping a movable clamping ring of the sleeve mechanism and is fixed on a device shell, the lifting mechanism comprises a lifting seat and a lifting driving mechanism, the lifting seat is accommodated in the device shell, and can be lifted or lowered under the driving of the lifting driving mechanism, so that the upper end of the sleeve and the lower end of the sleeve mechanism can be driven to be in butt joint or separation.

As a preferred embodiment of the present utility model, the lifting driving mechanism is a lifting driving cylinder or an oil cylinder, the lifting base includes a base, a support base connected to an upper surface of the base for inserting a lower end of the sleeve, and a circumferential side plate provided at an edge of the upper surface of the base, and an end portion of a piston rod of the lifting driving mechanism is connected to a lower surface of the base so as to be capable of lifting by telescopic driving of the piston rod.

Preferably, the first clamping mechanism is connected with the circumferential side plate, and the first clamping mechanism comprises a sleeve clamping cylinder and a sleeve clamping jaw in driving connection with the sleeve clamping cylinder.

More preferably, the sleeve clamp jaw includes a sleeve upper clamp jaw and a sleeve lower clamp jaw, and clamping portions of the sleeve upper clamp jaw and the sleeve lower clamp jaw are formed in a circular arc shape so as to be capable of surrounding and clamping an outer circumferential surface of the sleeve.

As another preferred embodiment of the present utility model, the second clamping mechanism is fixed to the device housing by a fixing plate.

As a further preferred embodiment of the utility model, the second clamping mechanism comprises a sleeve mechanism clamping cylinder and a sleeve mechanism clamping jaw in driving connection with the sleeve mechanism clamping cylinder.

As a specific structural form of the utility model, the sleeve mechanism clamping jaw comprises an upper sleeve mechanism clamping jaw and a lower sleeve mechanism clamping jaw, and the clamping portions of the upper sleeve mechanism clamping jaw and the lower sleeve mechanism clamping jaw are formed into circular arcs.

More specifically, the concave clamping surface of the clamping part of the clamping jaw of the sleeve mechanism is provided with a groove which is suitable for surrounding and accommodating the movable clamping ring for clamping the sleeve mechanism, and the sleeve mechanism can be ensured to rotate in the clamping state.

As another specific structural form of the present utility model, an operation hole for the sleeve to be inserted into to interface with the elevating mechanism is formed at the upper portion of the device housing.

In addition, another aspect of the present utility model provides a sleeve mechanism for use with the sleeve quick-change device according to any one of claims 1 to 9, the sleeve mechanism including an adapter for connection with a tightening shaft of an automation apparatus, a movable snap ring connected with the adapter and movable up and down, and a projection insertable into an upper end of the sleeve to be connectable with the sleeve, the second clamping mechanism being capable of clamping the movable snap ring.

Compared with the prior art, the utility model has at least the following beneficial effects:

the sleeve quick-changing device comprises a lifting mechanism for supporting the lower end of the sleeve, a first clamping mechanism fixed on the lifting mechanism and used for clamping the sleeve, and a second clamping mechanism used for clamping a movable clamping ring of the sleeve mechanism and fixed on a device shell, wherein the lifting mechanism comprises a lifting seat and a lifting driving mechanism which are accommodated in the device shell, the lifting seat can ascend or descend under the driving of the lifting driving mechanism, so that the upper end of the sleeve and the lower end of the sleeve mechanism can be driven to be in butt joint or separation.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

FIG. 1 is a schematic view of a specific embodiment of a sleeve quick change device of the present utility model;

FIG. 2 is a schematic view of a specific embodiment of the sleeve mechanism of the present utility model;

FIG. 3 is a schematic view of the first clamping mechanism of FIG. 1;

FIG. 4 is a cross-sectional view of the first clamping mechanism of FIG. 3;

FIG. 5 is a schematic view of the second clamping mechanism of FIG. 1;

fig. 6 is a cross-sectional view of the second clamping mechanism of fig. 5.

Description of the reference numerals

1 sleeve 2 lifting mechanism

201 lifting base 2011 base

2012 supporting seat 2013 circumferential side plate

202 lifting driving mechanism 3 first clamping mechanism

301 clamping cylinder 302 sleeve clamping jaw

3021 sleeve upper jaw 3022 sleeve lower jaw

4 second clamping mechanism 401 sleeve mechanism clamping cylinder

402 sleeve mechanism jaw 4021 sleeve mechanism upper jaw

4022 sleeve mechanism lower jaw 4023 groove

5 device housing 6 fixing plate

7 sleeve mechanism 701 adapter

702 movable clasp 7021 projection

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the term "arrangement" or "connection" should be interpreted in a broad sense, for example, the term "connection" may be a fixed connection, a removable connection, or an integral connection; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless otherwise indicated, the use of directional terms is based on the orientation or positional relationship shown in the drawings and does not indicate or imply that the device or element in question must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the utility model; the directional terms of the present utility model should be construed in connection with its actual installation state.

The present utility model will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, in one aspect, the present utility model provides a quick sleeve replacing device, which includes a lifting mechanism 2 for inserting a lower end of a sleeve 1 to support, a first clamping mechanism 3 fixed on the lifting mechanism 2 for clamping the sleeve 1, and a second clamping mechanism 4 fixed on a device housing 5 for clamping a movable clamp ring 702 of the sleeve mechanism 7, wherein the lifting mechanism 2 includes a lifting seat 201 and a lifting driving mechanism 202 which are accommodated in the device housing 5, and the lifting seat 201 can be lifted or lowered under the driving of the lifting driving mechanism 202, so that the upper end of the sleeve 1 can be driven to be in butt joint with or separated from the lower end of the sleeve mechanism 7.

In the above basic embodiment, the sleeve quick-change device of the present utility model can be used in combination with the sleeve mechanism 7, and it should be noted that the sleeve mechanism 7 belongs to a tightening tool, the upper end of the sleeve 1 is mounted at the lower end of the sleeve mechanism 7, and the lower end is used for tightening a bolt or a nut, and when the tightening shaft of the sleeve mechanism 7 rotates, the sleeve 1 rotates at the same time, so that the tightening effect can be achieved. The quick sleeve changing device of the utility model can remove and change the sleeve 1 on the sleeve mechanism 7, specifically, the utility model comprises a lifting mechanism 2 used for being inserted into the lower end of the sleeve 1 to support, a first clamping mechanism 3 fixed on the lifting mechanism 2 and used for clamping the sleeve 1, and a second clamping mechanism 4 used for clamping a movable clamping ring 702 of the sleeve mechanism 7 and fixed on the device shell 5, the lifting mechanism 2 comprises a lifting seat 201 and a lifting driving mechanism 202 which are accommodated in the device shell 5, the lifting seat 201 is matched with the first clamping mechanism 3 to be used, when the lifting driving mechanism 202 drives the lifting seat 201 to lift, the first clamping mechanism 3 rises together with the lifting seat 201, the lifting seat 201 can be inserted from the bottom of the sleeve 1 on the sleeve mechanism 7, and the first clamping mechanism 3 can clamp the sleeve 1, so that the sleeve 1 is separated from the sleeve mechanism 7 when the lifting driving mechanism 202 drives the lifting seat 201 to descend. The process of removing the sleeve from the sleeve mechanism 7 is described above, and when the utility model is changed for a new sleeve, the new sleeve is lifted by the lifting seat 201, so that the new sleeve is in butt joint with the sleeve mechanism 7. The sleeve quick-changing device can automatically and quickly change the sleeve, thereby improving the production operation efficiency.

As shown in fig. 1, in order to drive the lifting base 201 to move up and down, the lifting drive mechanism 202 is a lifting drive cylinder or an oil cylinder, and it is conceivable that a piston rod of the lifting drive mechanism 202 is connected to the bottom of the lifting base 201 so that the lifting base 201 can be driven to move up and down by extension and contraction of the piston rod. The lifting seat 201 comprises a base 2011, a supporting seat 2012 and a circumferential side plate 2013, wherein the supporting seat 2012 is used for being inserted into the lower end of the sleeve 1 so as to support the sleeve 1, the supporting seat 2012 is connected with the upper surface of the base 2011, the circumferential side plate 2013 is arranged along the upper surface edge of the base 2011, the supporting seat 2012 and the base 2011 can be connected by adopting a fastener, the circumferential side plate 2013 and the upper surface edge of the base 2011 are connected by adopting a fastener, and a piston rod of the lifting driving mechanism 202 is connected with the lower surface of the base 2011.

Preferably, as can be seen from fig. 1, the first clamping mechanism 3 is connected with the circumferential side plate 2013, the first clamping mechanism 3 comprises a sleeve clamping cylinder 301 and a sleeve clamping jaw 302 in driving connection with the sleeve clamping cylinder 301, the sleeve clamping cylinder 301 can drive the sleeve clamping jaw 302 to open and close, and the sleeve clamping cylinder 301 is connected with the circumferential side plate 2013.

More preferably, as can be seen from fig. 3 and 4, the sleeve clamp jaw 302 includes a sleeve upper clamp jaw 3021 and a sleeve lower clamp jaw 3022, and in order to enable the sleeve clamp jaw 302 to enclose and clamp the outer peripheral surface of the sleeve 1, the clamp portions of the sleeve upper clamp jaw 3021 and the sleeve lower clamp jaw 3022 are formed in a circular arc shape according to the sectional shape of the sleeve 1.

As another preferred embodiment of the present utility model, as can be seen from fig. 1, the second clamping mechanism 4 is fixed to the device housing 5 by a fixing plate 6. The device housing 5 is a casing of the sleeve quick-change device according to the present utility model, the lifting seat 201 is disposed inside the device housing, the two sides of the device housing 5 are provided with the fixing plates 6, the second clamping mechanism 4 is connected with the fixing plate 6 on one side of the device housing, in the present utility model, the fixing plate 6 and the device housing 5 may be connected by using a fastener, and the second clamping mechanism 4 and the fixing plate 6 may be connected by using a fastener. In addition, in order to facilitate the first clamping mechanism 3 to have a space for moving up and down by the lifting base 201, the device housing 5 is provided with a through hole on a side surface thereof, which enables the first clamping mechanism 3 to be lifted.

As still another preferred embodiment of the present utility model, the second clamping mechanism 4 includes a sleeve mechanism clamping cylinder 401 and a sleeve mechanism clamping jaw 402 drivingly connected to the sleeve mechanism clamping cylinder 401, wherein the sleeve mechanism clamping cylinder 401 is capable of driving the sleeve mechanism clamping jaw 402 to open and close, and the present utility model can connect the sleeve mechanism clamping cylinder 401 of the second clamping mechanism 4 with the fixing plate 6 by a fastener.

As a specific structural form of the present utility model, as shown in fig. 5 and 6, the sleeve mechanism 7 holding jaw 402 includes a sleeve mechanism upper holding jaw 4021 and a sleeve mechanism lower holding jaw 4022, the gripping portions of the sleeve mechanism upper holding jaw 4021 and the sleeve mechanism lower holding jaw 4022 are formed in circular arc shapes, and the sleeve mechanism upper holding jaw 4021 and the sleeve mechanism lower holding jaw 4022 are operated by the sleeve mechanism clamping cylinder 401 so as to be able to enclose and clamp the movable snap ring 702 of the sleeve mechanism 7. Here, the movable snap ring 702 can move up and down on the sleeve mechanism 7, when the movable snap ring 702 moves up, the connection structure between the sleeve mechanism 7 and the sleeve 1 can be disengaged, and when the movable snap ring 702 is reset, the sleeve mechanism 7 and the sleeve 1 are connected. When the sleeve quick-changing device disclosed by the utility model is used for changing the sleeve 1, the movable clamping ring 702 of the sleeve mechanism 7 is clamped by the second clamping mechanism 4, then the sleeve mechanism 7 is pressed down, so that the movable clamping ring 702 can move upwards on the sleeve mechanism 7 relative to the sleeve mechanism 7, the pressing down is stopped, and the movable clamping ring 702 is reset, so that the sleeve mechanism 7 and the sleeve 1 are disconnected or connected.

More specifically, the concave clamping surface of the gripping portion of the sleeve mechanism jaw 402 is provided with a groove 4023 adapted to enclose and accommodate the movable snap ring 702 for clamping the sleeve mechanism 7, and the provision of the groove 4023 can ensure that the sleeve mechanism 7 can be rotated in the clamped state, and by rotating the sleeve mechanism 7, the sleeve mechanism 7 and the sleeve 1 can be mounted in place.

As another specific structural form of the present utility model, the upper portion of the device housing 5 is formed with a work hole for the sleeve 1 to be inserted into to interface with the elevating mechanism 2. The lifting seat 201 is located inside the device housing 5, and a working hole is formed in the upper portion of the device housing 5, so that the sleeve 1 can conveniently enter and exit the device housing 5 through the working hole, and it is conceivable that the fixing plates 6 are arranged at positions, close to the working hole, on both sides of the device housing 5, so that the second clamping mechanism 4 can clamp the sleeve mechanism 7 which moves in place.

The process of removing the sleeve 1 from the sleeve mechanism 7 and replacing a new sleeve with the sleeve mechanism 7 of the sleeve quick-change device of the present utility model will be described below in order to better understand the technical solution of the present utility model.

The sleeve quick-change device of the utility model takes down the sleeve from the sleeve mechanism 7, and the action process is as follows:

first, the sleeve mechanism 7 moves with the sleeve 1 in place, and the sleeve mechanism 7 clamping cylinder 401 of the second clamping mechanism 4 acts to close the sleeve mechanism 7 clamping jaw 402, so that the sleeve mechanism 7 clamping jaw 402 clamps the sleeve mechanism 7;

then, the sleeve mechanism 7 is pressed down to disengage the sleeve 1 from the sleeve mechanism 7;

then, the sleeve clamping cylinder 301 of the first clamping mechanism 3 is actuated so that the sleeve clamping jaw 302 clamps the sleeve;

then, the piston rod of the lifting drive mechanism 202 is retracted, and the lifting seat 201 is driven to descend, so that the sleeve clamping jaw 302 is separated from the sleeve mechanism 7 with the sleeve 1;

finally, the sleeve mechanism clamping cylinder 401 of the second clamping mechanism 4 acts such that after the sleeve mechanism jaws 402 are opened, the sleeve mechanism 7 is retracted.

The process of replacing the new sleeve by the sleeve quick-replacing device comprises the following steps:

first, the sleeve mechanism 7 is moved into position, at which time the sleeve mechanism jaw 402 of the second clamping mechanism 4 is in an open state and the piston rod of the lift drive mechanism 202 is in a retracted state;

then, the sleeve clamping cylinder 301 of the first clamping mechanism 3 is actuated so that the sleeve clamping jaw 302 clamps the sleeve 1;

then, the piston rod of the lifting driving mechanism 202 extends out to drive the lifting seat 201 to ascend, so that the sleeve clamping jaw 302 is abutted with the sleeve mechanism 7 with the sleeve 1;

then, the sleeve mechanism clamping cylinder 401 of the second clamping mechanism 4 acts to enable the sleeve mechanism clamping jaw 402 to be closed, so that the sleeve mechanism clamping jaw 402 clamps the sleeve mechanism 7, the sleeve mechanism 7 is pressed down and rotated, the sleeve mechanism 7 stops rotating after rotating in place, and therefore the sleeve mechanism 7 and the sleeve 1 are installed in place;

next, the piston rod of the lift drive mechanism 202 is retracted, the sleeve clamp jaw 302 of the first clamping mechanism 3 is opened, and the sleeve mechanism clamp jaw 402 of the second clamping mechanism 4 is opened;

finally, the sleeve mechanism 7 is retracted.

In addition, the present utility model also provides a sleeve mechanism 7, the sleeve mechanism 7 being a sleeve mechanism 7 for use with the sleeve quick change device according to any one of claims 1 to 9, the sleeve mechanism 7 comprising an adapter 701 for connection with a tightening shaft of an automation apparatus, a movable snap ring 702 connected with the adapter 701 and movable up and down, and a projection 7021 capable of being inserted into an upper end of the sleeve 1 to be connectable with the sleeve 1, as shown in fig. 2, the second clamping mechanism 4 being capable of clamping the movable snap ring 702. The adapter 701 can be connected with a tightening shaft of an automation device, so that the sleeve mechanism 7 has a tightening function, the movable snap ring 702 has a certain activity on the sleeve mechanism 7, it is to be noted that the movable snap ring 702 moves up and down to drive the steel balls on the protruding portion 7021 to protrude and retract, the protruding portion 7021 can be in a square column structure to connect and disconnect the sleeve mechanism 7 and the sleeve 1, a square hole matched with the protruding portion 7021 is formed at the upper end of the sleeve 1, during installation, the protruding portion 7021 is firstly inserted into the square hole at the upper end of the sleeve 1, then the sleeve mechanism 7 is pressed down, the steel balls retract, the sleeve mechanism 7 is rotated to enable the sleeve mechanism 7 to be in place with the sleeve 1, finally the sleeve mechanism 7 is reset, and the sleeve mechanism 7 is connected with the sleeve 1 through the steel balls, so that the principle of disconnecting the sleeve mechanism 7 from the sleeve 1 can be also considered, and details of the sleeve mechanism 7 and the sleeve 1 are omitted.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present utility model within the scope of the technical concept of the present utility model, and all the simple modifications belong to the protection scope of the present utility model.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition.

Moreover, any combination of the various embodiments of the utility model can be made without departing from the spirit of the utility model, which should also be considered as disclosed herein.

Claims (10)

1. The utility model provides a sleeve quick change device, its characterized in that, including being used for inserting elevating system (2) that the lower extreme of sleeve (1) supported, be fixed in be used for on elevating system (2) press from both sides tight first clamping mechanism (3) of sleeve (1) and be used for pressing from both sides movable snap ring (702) of sleeve mechanism (7) and be fixed in second clamping mechanism (4) on device casing (5), elevating system (2) including hold in elevating system (201) and lift actuating mechanism (202) of device casing (5), elevating system (201) can rise or descend under the drive of lift actuating mechanism (202), thereby can drive the upper end of sleeve (1) with the lower extreme of sleeve mechanism (7) is docked or is separated.

2. The quick sleeve replacing device according to claim 1, wherein the lifting driving mechanism (202) is a lifting driving cylinder or an oil cylinder, the lifting base (201) comprises a base (2011), a supporting base (2012) connected with the upper surface of the base (2011) and used for being inserted into the lower end of the sleeve (1), and a circumferential side plate (2013) arranged at the edge of the upper surface of the base (2011), and the end part of a piston rod of the lifting driving mechanism (202) is connected with the lower surface of the base (2011) so as to drive the lifting base (201) to lift through the telescopic movement of the piston rod.

3. The quick sleeve changing device according to claim 2, characterized in that the first clamping mechanism (3) is connected with the circumferential side plate (2013), the first clamping mechanism (3) comprising a sleeve clamping cylinder (301) and a sleeve clamping jaw (302) in driving connection with the sleeve clamping cylinder (301).

4. A sleeve quick change device according to claim 3, characterized in that the sleeve clamp jaw (302) comprises a sleeve upper clamp jaw (3021) and a sleeve lower clamp jaw (3022), the clamping portions of the sleeve upper clamp jaw (3021) and the sleeve lower clamp jaw (3022) being formed in a circular arc shape so as to be able to enclose and clamp the outer circumferential surface of the sleeve (1).

5. Sleeve quick change device according to claim 1, characterized in that the second clamping mechanism is fixed to the device housing (5) by means of a fixing plate (6).

6. The quick sleeve changing device according to claim 5, characterized in that the second clamping mechanism (4) comprises a sleeve mechanism clamping cylinder (401) and a sleeve mechanism clamping jaw (402) in driving connection with the sleeve mechanism clamping cylinder (401).

7. The sleeve quick change device according to claim 6, wherein the sleeve mechanism clamping jaw (402) comprises a sleeve mechanism upper clamping jaw (4021) and a sleeve mechanism lower clamping jaw (4022), and the clamping portions of the sleeve mechanism upper clamping jaw (4021) and the sleeve mechanism lower clamping jaw (4022) are formed in a circular arc shape.

8. The quick sleeve changing device according to claim 7, characterized in that the clamping concave surface of the clamping part of the sleeve mechanism clamping jaw (402) is provided with a groove (4023) which is suitable for enclosing and accommodating the movable clamping ring (702) clamping the sleeve mechanism (7), and can ensure that the sleeve mechanism (7) can rotate in a clamping state.

9. A quick sleeve changing device according to claim 5, characterized in that the upper part of the device housing (5) is formed with a working hole for the sleeve (1) to extend into for interfacing with a lifting mechanism.

10. Sleeve mechanism, characterized in that it is a sleeve mechanism (7) for use with a sleeve quick change device according to any one of claims 1 to 9, said sleeve mechanism (7) comprising an adapter (701) for connection with a tightening shaft of an automation device, a movable snap ring (702) connected with said adapter (701) and being movable up and down, and a projection (7021) insertable into the upper end of said sleeve (1) so as to be connectable with said sleeve (1), said second clamping mechanism (4) being capable of clamping said movable snap ring (702).