CN102950740A

CN102950740A - Multilayer extrusion press for manufacturing tires

Info

Publication number: CN102950740A
Application number: CN2011103175837A
Authority: CN
Inventors: 黄龟渊
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-24
Filing date: 2011-10-18
Publication date: 2013-03-06
Anticipated expiration: 2031-10-18
Also published as: DE102011084110B4; CN102950740B; KR20130021829A; DE102011084110A1; KR101716706B1

Abstract

The multilayer extrusion press comprises multiple extrusion cylinders (11) and multiple swivel heads (20), which are connected with a base body (10). The swivel heads are attached on dispensing holes of the extrusion cylinder, such that the swivel heads are tightly connected with each other. A through-hole is completely formed throughout the corresponding swivel head. A clamping rod (30) is arranged in an axial direction, which moves back and forth, and on whose front side a stopper is formed. A pressure wedge (50) is provided, which moves transverse to the clamping rod.

Description

Tire manufacturing multilayer extrusion machine

Technical field

The present invention relates to such tire manufacturing multilayer extrusion machine: be provided with a plurality of extrusion cylinders 11 and swivel head 20, a plurality of swivel heads 20 are close to combination and are formed multilayer extrusion logistics road, thereby extrude and stacked extrudate of being discharged by the extrusion cylinder 11 that differs from one another, this tire manufacturing with the multilayer extrusion machine by at the clamp bar (clamp rod) of being close to fixing and open state 30 that be used for to adjust swivel head 20 tilted block 60 that is formed with inclined plane 61 being set, and setting contacts with the inclined plane 61 of this tilted block 60 and compressing voussoir 50 or compressing roller 52 by oppressing cylinder 59 drivings, along with mobile these compressing voussoirs 50 or compressing roller 52, can be to the stronger power of axial action of the clamp bar 30 that is provided with tilted block 60, thus can realize swivel head 20 firm be close to combination.

In addition, be provided for adjusting the conjunction (binder) 40 of restrained condition of stopper (stopper) 28 of the front end of clamp bar 30 at the swivel head 20 that embeds clamp bar 30, thereby in the situation of rotating clamp claw beam not 30 itself, also can adjust simply the stationary state of swivel head 20.

Background technology

How many manufacturing processes of the tire take rubber as main component there are differences on detail section according to the kind of tire, but basic manufacturing process is by middle forming process and add the spring operation and consist of, in this centre forming process, raw material are manufactured dish or band shape, and it is wound in drum and consists of the basic configuration of tire, add at this and to put it into mould (mold) in spring operation and apply heat and pressure, thus the shape of finishing and give elasticity.

Expression only possesses the green tire (green tire) of the basic configuration of tire among Fig. 1 as the semi-finished product that pass through middle forming process, by this figure as can be known, green tire is made of rubber extruding thing etc., and by stacked and curling the forming of the different a plurality of shoestring of physical property.

The rubber extruding thing of stacked state like this is to come the stacked shoestring of finishing extrusion molding by other operation, perhaps extrudes by multilayer extrusion machine as shown in Figure 2 and the different extrudate of stacked physical property consists of.

By Fig. 2 and Fig. 3 as can be known, the multilayer extrusion machine is following structure: be provided with a plurality of extrusion cylinders 11 and swivel head 20, a plurality of swivel heads 20 are close to combination and are formed multilayer extrusion logistics road, thereby extrude the extrudate that the stacked physical property of being discharged by the extrusion cylinder 11 that differs from one another of also welding differs from one another, maintenance management for the sedimentary extruder of removing the extrudate runners such as discharge opening that extrude cylinder 11, as shown in Figure 3, swivel head 20 is rotated take an axle 21 as axle and is open, thereby exposes the runner of extrudate.

Namely, as shown in Figure 2, when extruding extrudate when being built in screw rod 12 rotations that extrude cylinder 11, with clamp cylinder (clamp cylinder) 29 stoppers that are connected (stopper) 28 compressing swivel heads 20,, swivel head 20 is close to combination thereby overcoming extrusion the spuing pressure of cylinder 11 and the runner of formation extrudate, as shown in Figure 3, in the time of need to exposing the runner of extrudate considering maintenance management, by an axle 21 and main body 10 chain connections and with launch swivel head 20 that cylinder 27 is connected by launching cylinder 27 and rotate take an axle 21 as axle, thereby open.

Shown in the upper diagram of Fig. 4, extruding the in service of cylinder 11, being close to of swivel head 20 is that stopper 28 is oppressed swivel head 20 rearward by clamp cylinder 29 and formed, shown in the bottom graph of this Fig. 4, after stopper 28 is rotated, retreat and break away from from the through hole 22 that is formed at swivel head 20, thereby remove the restrained condition of swivel head 20.

As mentioned above, in swivel head 20 formula multilayer extrusion machines in the past, the lateral pressure that extends axially of clamp cylinder 29 directly acts on swivel head 20 and is close to swivel head 20 fixing by stopper 28, and when removing the restrained condition of swivel head 20, rotation stopper 28 and break away from from through hole 22, and at the pressure of keeping clamp cylinder 29, effectively overcome the extrusion cylinder 11 that acts on swivel head 20 the pressure that spues, stopper 28 is retreated rotational structure aspect have problems.

At first, in order firmly to keep the stationary state of being close to of swivel head 20, should make stopper 28 oppress forcefully swivel head 20, be necessary to keep the lateral pressure that extends axially of certain and strong clamp cylinder 29 as fluid cylinder for this reason, but the pressure that spues that acts on the extrusion cylinder 11 of swivel head 20 is directly delivered to clamp cylinder 29 by stopper 28 and piston rod (piston rod), therefore causes clamp cylinder 29 to be exposed to for a long time in the pressure that spues that extrudes cylinder 11.

Characteristic from fluid cylinder, when acting on the axial force of long-time continuous, owing to be restricted aspect the compactness of the cylinder interior of keeping reactive fluid pressure etc., thereby may cause output to descend, therefore needing for a long time provides firmly the clamp cylinder 29 of adhesion force need to guarantee that specific pressure goes out the more excellent output of the pressure that spues of cylinder 11 to swivel head 20, therefore has the problem of large-scale, the jumbo fluid cylinder that needs to use high price.

In addition, when rotating stopper 28 for the restrained condition of adjusting swivel head 20, need to cut apart as connecting the piston rod of stopper 28 with the axle of clamp cylinder 29, and the other rotary units such as motor and gear are set at the axle of cutting apart, perhaps form and to rotate the overall structure that is connected with clamp cylinder 29 and stopper 28, but there is thus following deep problem: the structure complicated of whole extruder, manufacturing expense rises, and the segmentaion position of piston rod is the frangible portion on the mechanics, thus initiating failure etc.

Summary of the invention

The present invention puts in view of the above problems and researches and develops, the invention provides such tire manufacturing multilayer extrusion machine: it is provided with a plurality of extrusion cylinders 11, be provided with and main body 10 hinged a plurality of swivel heads 20 at the discharge opening that extrudes cylinder 11, be close to combination by these a plurality of swivel heads 20 and form multilayer extrusion logistics road, the extrudate that spues from a plurality of extrusion cylinders 11 thus is extruded and is stacked, this tire manufacturing is characterised in that with the multilayer extrusion machine, before and after being formed with, it connects the through hole 22 of swivel head 20, in the mode that can come and go in the axial direction clamp bar (clamp rod) 30 is set, be fixedly installed the tilted block 60 that has formed in front inclined plane 61 at this clamp bar 30, be formed with stopper (stopper) 28 at front end, and, the leading section of this clamp bar 30 is embedded in the through hole 22 of swivel head 20, front side at tilted block 60 is provided with the compressing voussoir 50 that drives and be formed with in the back anti-obliquity face 51 by the compressing cylinder 59 that is fixed in main body 10, along with compressing voussoir 50 moves to the direction of intersecting with clamp bar 30, the anti-obliquity face 51 of compressing voussoir 50 contacts with the inclined plane 61 of tilted block 60, and tilted block 60 and clamp bar 30 retreat.

And, the invention provides such tire manufacturing multilayer extrusion machine: it is provided with a plurality of extrusion cylinders 11, be provided with and main body 10 hinged a plurality of swivel heads 20 at the discharge opening that extrudes cylinder 11, be close to combination by these a plurality of swivel heads 20 and form multilayer extrusion logistics road, the extrudate that spues from a plurality of extrusion cylinders 11 thus is extruded and is stacked, this tire manufacturing is characterised in that with the multilayer extrusion machine, before and after being formed with, it connects the through hole 22 of swivel head 20, in the mode that can come and go in the axial direction clamp bar (clamp rod) 30 is set, be fixedly installed the tilted block 60 that has formed in front inclined plane 61 and vertical plane 62 at this clamp bar 30, and be formed with stopper (stopper) 28 at front end, the leading section of this clamp bar 30 is embedded in the through hole 22 of swivel head 20, be provided with by the compressing cylinder 59 that is fixed in main body 10 at the front side of tilted block 60 and drive and a pair of compressing roller 52 of spaced configuration, along with compressing roller 52 moves to the direction of intersecting with clamp bar 30, compressing roller 52 contacts with inclined plane 61 and the vertical plane 62 of tilted block 60 successively, and tilted block 60 and clamp bar 30 retreat and be fixed.

And, the invention provides such tire manufacturing multilayer extrusion machine: it is provided with a plurality of extrusion cylinders 11, be provided with and main body 10 hinged a plurality of swivel heads 20 at the discharge opening that extrudes cylinder 11, be close to combination by these a plurality of swivel heads 20 and form multilayer extrusion logistics road, the extrudate that spues from a plurality of extrusion cylinders 11 thus is extruded and is stacked, this tire manufacturing is characterised in that with the multilayer extrusion machine, before and after being formed with, it connects the through hole 22 of swivel head 20, and be formed with the reamer 23 concentric with through hole 22 at the front face of swivel head 20, be provided with the clamp bar (clamp rod) 30 that has formed radial outstanding stopper (stopper) 28 at front end in the mode that can come and go in the axial direction, the leading section of this clamp bar 30 is embedded in the through hole 22 of swivel head 20, front end is connected with the drive division 41 that is fixed in swivel head 20 and the conjunction (binder) 40 that is formed with the hollow of access hole 42 and stopper protrusion 43 in the rear end is embedded in the reamer 23, stopper 28 at the clamp bar 30 by through hole 22 enters under the state of conjunction 40 inside by access hole 42, along with conjunction 40 is rotated by drive division 41, the ordered state of stopper 28 and stopper protrusion 43 is changed, thus stopper 28 restrained and releasings.

According to the present invention, the tire manufacturing not only can be kept securely with the stationary state of being close to of the swivel head of multilayer extrusion machine, and the low phenomenon of pressure of the fluid cylinder that fixedly occurs during swivel head for a long time by fluid cylinder and the relaxation that consequent swivel head is close to state can be fundamentally prevented.

And, in the situation of not rotating the clamp bar of being close to state itself of keeping swivel head, the conjunction of swivel head is located in rotation, thereby can adjust the restrained condition of clamp bar, therefore can guarantee the durability of the relevant apparatus such as clamp bar, realize the simplification of whole apparatus structure.

Thus, prevent in the past tire manufacturing with the take place frequently leakage of the living lax extrudate that causes of being close to state by swivel head of the driving process intermediate frequency of multilayer extrusion machine, thereby can improve the quality of extrudate, and the necessity of the follow-up effect that alleviated postprocessing working procedures such as removal waste material (scrap), is caused by the extrudate leakage of extruder outage and repairing etc. can obtain the effect that improves functioning efficiency and save manufacturing expense in the tire builder order.

Description of drawings

Fig. 1 is the diagrammatic illustration figure of tire builder order.

Fig. 2 is the representative profile figure of the driving condition of multilayer extrusion machine in the past.

Fig. 3 is the representative profile figure of open state of the swivel head of multilayer extrusion machine in the past.

Fig. 4 is the key diagram of the way of restraint of the swivel head of multilayer extrusion machine in the past.

Fig. 5 is the representative profile figure of the restrained condition of swivel head according to an embodiment of the present invention.

Fig. 6 is the representative profile figure of open state of swivel head of the embodiment of Fig. 5.

Fig. 7 is the key diagram of the way of restraint of swivel head of the embodiment of Fig. 5.

Fig. 8 is the schematic partial cross-sectional view that extracts of conjunction and the clamp bar of Fig. 5 embodiment.

Fig. 9 is the schematic partial cross-sectional view of work system of clamp bar of the embodiment of Fig. 5.

Figure 10 is the extraction schematic diagram of major part of the present invention.

Figure 11 is the representative profile figure that has been suitable for the one embodiment of the present invention of rest pad.

Figure 12 is the extraction schematic partial cross-sectional view of major part of the embodiment of Figure 11.

Figure 13 is the representative profile figure that has been suitable for the one embodiment of the present invention of compressing roller.

Figure 14 is the extraction schematic partial cross-sectional view of major part of the embodiment of Figure 13.

Symbol description

10 main bodys

11 extrude cylinder

12 screws

19 scaffolds

20 swivel heads

21 axles

22 through holes

23 reamer

27 launch cylinder

28 stoppers (stopper)

29 clamp cylinders

30 clamp bars (clamp rod)

39 come and go cylinder

40 conjunctions

41 drive divisions

42 access holes

43 stopper protrusion

50 compressing voussoirs

51 anti-obliquity faces

55 otch

59 compressing cylinders

60 tilted blocks

61 inclined planes

62 vertical planes

70 rest pads

The specific embodiment

Below, with reference to description of drawings concrete structure of the present invention and operation principle.

At first, Fig. 5 is the representative profile figure of the present invention that is close under the state that has made up swivel head 20, by this figure as can be known, connects clamp bar 30 restrained and releasing by conjunction 40 of swivel head 20, is fixedly installed tilted block 60 at clamp bar 30.

Be connected with in the rear end of clamp bar 30 and come and go cylinder 39, along with round cylinder 39 carries out work, clamp bar 30 is to axially coming and going movement, is provided with the compressing voussoir 50 that drives by oppressing cylinder 59 at the front side of the tilted block 60 of being located at clamp bar 30.

In the illustrated embodiment, compressing cylinder 59 is located on the direction with clamp bar 30 quadratures, and the compressing voussoir 50 that drives by compressing cylinder 59 also moves to the direction with clamp bar 30 quadratures.

As shown in Figure 6, behind the restrained condition of removing clamp bar 30, when clamp bar 30 retreats by coming and going cylinder 39, swivel head 20 is in operating state, and carry out work along with launching cylinder 27, opened when swivel head 20 is rotated take an axle 21 as axle, thereby exposed the runner with the extrudate headed by the discharge opening that extrudes cylinder 11.

Fig. 7 is the extraction schematic partial cross-sectional view that is used for the main composition important document that swivel head 20 retrained in the work that extrudes cylinder 11 among the present invention, by this figure as can be known, be formed with the through hole 22 that passes through for clamp bar 30 at swivel head 20, be formed with reamer 23 in concentric mode in the through hole 22 of the front face of swivel head 20, columnar conjunction 40 is embedded in this reamer 23.

Drive respectively the round cylinder 39 of clamp bar 30 and compressing voussoir 50 and the main body 10 that compressing cylinder 59 is fixed in multilayer extrusion machine of the present invention, in the illustrated embodiment, form integrated with main body 10 or be fixed in the scaffold 19 of the closed form that is attached to main body 10, and the fixed form between these round cylinders 39, compressing cylinder 59 and main body 10 is to select the item that is suitable for by those skilled in the art, does not therefore do the concrete restriction of claim.

Fig. 8 is the extraction schematic partial cross-sectional view of conjunction 40 of the present invention and clamp bar 30, front end at clamp bar 30 is formed with radial outstanding stopper 28, be formed with in the rear end of the cylindrical shape conjunction 40 of hollow the section shape that passes through for described stopper 28 access hole 42 and with the stopper protrusion 43 of the protuberance equal number of stopper 28, thereby regulate the restrained condition of stopper 28 along with rotation conjunction 40.

Namely, enter under the state of conjunction 40 inside at the stopper 28 of clamp bar 30 access hole 42 by conjunction 40, when conjunction 40 rotation and so that when stopping that the protuberance of projection 43 and stopper 28 is arranged on the same straight line, stopper 28 is restrained, when conjunction 40 reverses and so that stop that projection 43 protuberances from stopper 28 are when staggering, the restrained condition of stopper 28 is disengaged, and clamp bar 30 can retreat.

In the illustrated embodiment, the projection that stops of the protuberance of stopper 28 and conjunction 40 consists of with the interval of 120 degree, can retrain and remove by the forwards, reverse of carrying out 60 degree in connection with part 40,3 point types by such stopper 28 are fixed, and can prevent by the generation of the eccentric stress that does not wait the clamp bar 30 that contact causes between the stopper protrusion of the protuberance of stopper 28 and conjunction 40 etc.

As shown in Figure 7, conjunction 40 of the present invention is connected with drive division 41 and embeds reamer 23, and drive division 41 is fixed in swivel head 20.

Can be suitable for the multiple means that the generations such as electric motor, hydraulic electric motor rotatablely move as the drive division 41 that applies revolving force to conjunction 40, although do not need the above rotation of 360 degree, but need to carry out accurately being rotated in the forward and counter-rotating of angle, by being set, a plurality of fluid cylinder carrying out easily the characteristic of the present invention that hydraulic pressure is applied flexibly, preferably at drive division 41 applicable rotary actuators (rotary actuator).

Fig. 9 is the extraction schematic partial cross-sectional view of constitutive requirements part that compressing cylinder 59, compressing voussoir 50 and the tilted block 60 etc. of axial stronger compressing power are provided to clamp bar 30, be fixedly installed the tilted block 60 that has formed in front inclined plane 61 with the mode that can carry out in the axial direction back and forth movement and the clamp bar 30 of scaffold 19 combinations, be provided with the compressing voussoir 50 that comes and goes in the direction with clamp bar 30 quadratures by the compressing cylinder 59 that is fixed in scaffold 19 at the front side of this tilted block 60.

Be formed with the anti-obliquity face 51 corresponding with the inclined plane 61 of tilted block 60 in the back of compressing voussoir 50, as shown in figure 10, when compressing voussoir 50 moves to the direction with clamp bar 30 quadratures, the inclined plane 61 of tilted block 60 contacts with each other with the anti-obliquity face 51 of compressing voussoir 50, and applies stronger compressing power along the axial rearward direction side of clamp bar 30.

At this moment, so that the tiltangleθ that is made of the anti-obliquity face 51 of oppressing voussoir 50 and the axle of oppressing cylinder 59 is below 45 degree, when thereby the output that will oppress cylinder 59 was delivered to clamp bar 30 effectively, the pressure that spues that has suppressed to greatest extent to act on the compressing cylinder 11 of clamp bar 30 was delivered to compressing voussoir 50 and compressing cylinder 59.

As mentioned above, by suppressing so that the transmission of the pressure that spues of the lax compressing cylinder 11 of the output of compressing cylinder 59, thereby not only can keep effective output of compressing cylinder 59, and reduce required output and will oppress cylinder 59 miniaturizations.

In addition, at the lower end of compressing voussoir 50 central part formation otch 55, do not clash so that in the driving process of compressing voussoir 50, oppress between voussoir 50 and the clamp bar 30.

In Figure 11 and Figure 12, be fixed in the rest pad 70 of main body 10 in the front side setting of compressing voussoir 50, thereby can be prevented from oppressing by the pressure that spues that transmits the axial compressing cylinder 11 that acts on clamp bar 30 by clamp bar 30 and tilted block 60 phenomenon of piston rod (piston rod) distorted of cylinder 59.

That is, such as the enlarging section in Figure 11 oval and shown in Figure 12, when compressing voussoir 50 moves, support when the front of compressing voussoir 50 contact with rest pad 70 and oppress voussoir 50, thereby can suppress to oppress the distortion of the piston rod of cylinder 59.

In the illustrated embodiment, the mode of adhering to make separately with main body 10 or scaffold 19 is provided with rest pad 70, but also can be fabricated to one with main body 10 or scaffold 19.

In Figure 13 and Figure 14, form inclined plane 61 and vertical plane 62 at tilted block 61, and consist of a pair of compressing roller 52 that carries out lifting by compressing cylinder 59, thereby mobile and constant tilt piece 61, when entering the vertical plane 62 of 61 bottoms, inclined plane when 52 declines of compressing roller, the pressure that spues of compressing cylinder 11 is not delivered to compressing cylinder 59 fully.

Namely, as shown in figure 14, inclined plane 61 and vertical plane 62 are formed respectively at top and bottom in the front of the tilted block 60 of being located at clamp bar (clamp rod) 30, the a pair of compressing roller 52 of spaced configuration is set at the front end of the compressing cylinder 59 that is fixed in main body 10, so that compressing roller 52 is positioned at the front side of tilted block 60, thereby along with compressing roller 52 moves to the direction with clamp bar 30 quadratures, can so that the compressing roller 52 contact successively with inclined plane 61 and the vertical plane 62 of tilted block 60, and so that tilted block 60 and clamp bar 30 retreated and fixed.

By the enlarging section in the ellipse of Figure 13 as can be known, along with compressing roller 52 descends by compressing cylinder 59, compressing roller 52 descends when contacting with the inclined plane 61 on the top of an end tilted block 60, thereby tilted block 60 moves, when entering the vertical plane 62 of tilted block 60 bottoms when compressing roller 52 continuous decreases, although the movement of tilted block 60 is ended, but the pressure that spues that acts on the extrusion cylinder 11 of tilted block 60 only works to the direction vertical with the axle of compressing cylinder 59, and do not have the axial component composition of oppressing cylinder 59, therefore can cut off fully so that oppress the transmission of the pressure that spues of the lax extrusion cylinder 11 of the output of cylinder 59.

Claims

1. tire manufacturing multilayer extrusion machine, it is provided with a plurality of extrusion cylinders (11), be provided with and the hinged a plurality of swivel heads of main body (10) (20) at the discharge opening that extrudes cylinder (11), be close to combination by these a plurality of swivel heads (20) and form multilayer extrusion logistics road, the extrudate that spues from a plurality of extrusion cylinders (11) thus is extruded and is stacked

This tire manufacturing is characterised in that with the multilayer extrusion machine,

Before and after being formed with the multilayer extrusion machine, this tire manufacturing connects the through hole (22) of swivel head (20),

Be provided with clamp bar (30) in the mode that can come and go in the axial direction, this clamp bar (30) is fixedly installed the tilted block (60) that has formed in front inclined plane (61), and be formed with stopper (28) at front end, and, the leading section of this clamp bar (30) is embedded in the through hole (22) of swivel head (20)

Front side at tilted block (60) is provided with the compressing voussoir (50) that drives and be formed with in the back anti-obliquity face (51) by the compressing cylinder (59) that is fixed in main body (10),

Along with compressing voussoir (50) moves to the direction of intersecting with clamp bar (30), the anti-obliquity face (51) of compressing voussoir (50) contacts with the inclined plane (61) of tilted block (60), and tilted block (60) and clamp bar (30) retreat.

2. tire manufacturing multilayer extrusion machine, it is provided with a plurality of extrusion cylinders (11), be provided with and the hinged a plurality of swivel heads of main body (10) (20) at the discharge opening that extrudes cylinder (11), be close to combination by these a plurality of swivel heads (20) and form multilayer extrusion logistics road, the extrudate that spues from a plurality of extrusion cylinders (11) thus is extruded and is stacked

In the mode that can come and go in the axial direction clamp bar (30) is set, this clamp bar (30) is fixedly installed the tilted block (60) that has formed in front inclined plane (61) and vertical plane (62), and be formed with stopper (28) at front end, and, the leading section of this clamp bar (30) is embedded in the through hole (22) of swivel head (20)

Be provided with by the compressing cylinder (59) that is fixed in main body (10) at the front side of tilted block (60) and drive and a pair of compressing roller (52) of spaced configuration,

Along with compressing roller (52) moves to the direction of intersecting with clamp bar (30), compressing roller (52) contacts with inclined plane (61) and the vertical plane (62) of tilted block (60) successively, and tilted block (60) and clamp bar (30) are retreated and fix.

3. tire manufacturing multilayer extrusion machine, it is provided with a plurality of extrusion cylinders (11), be provided with and the hinged a plurality of swivel heads of main body (10) (20) at the discharge opening that extrudes cylinder (11), be close to combination by these a plurality of swivel heads (20) and form multilayer extrusion logistics road, the extrudate that spues from a plurality of extrusion cylinders (11) thus is extruded and is stacked

Connect the through hole (22) of swivel head (20) before and after this tire manufacturing is formed with the multilayer extrusion machine, and be formed with the reamer (23) concentric with through hole (22) at the front face of swivel head (20),

Be provided with the clamp bar (30) that has formed radial outstanding stopper (28) at front end in the mode that can come and go in the axial direction, and, the leading section of this clamp bar (30) is embedded in the through hole (22) of swivel head (20)

Front end is connected with the drive division that is fixed in swivel head (20) (41) and the conjunction (40) that is formed with the hollow of access hole (42) and stopper protrusion (43) in the rear end is embedded in the reamer (23),

Stopper (28) at the clamp bar (30) by through hole (22) enters by access hole (42) under the inner state of conjunction (40), along with conjunction (40) is rotated by drive division (41), stopper (28) is changed with the ordered state of stopper protrusion (43), the thus restrained and releasing of stopper (28).