CN203417915U

CN203417915U - Core rod centering device for puncher

Info

Publication number: CN203417915U
Application number: CN201320481237.7U
Authority: CN
Inventors: 朱平; 吕增宝; 王伟; 唐忞
Original assignee: CHANGSHU MEILI MACHINERY MANUFACTURE Co Ltd
Current assignee: CHANGSHU MEILI MACHINERY MANUFACTURE Co Ltd
Priority date: 2013-08-07
Filing date: 2013-08-07
Publication date: 2014-02-05
Anticipated expiration: 2023-08-07

Abstract

The utility model discloses a core rod centering device for a puncher, and belongs to the technical field of steel tube machining machinery. The core rod centering device for the puncher comprises a base plate, a rack drive mechanism, a gear drive bar, an upper gear shaft, a lower gear shaft, a core rod driving clamping and releasing mechanism and core rod vertical synchronous clamping and releasing mechanisms. A pair of wall plates is fixed to the base plate, and the upper portions of the wall plates are respectively provided with a rack drive device installation and fixing face and a cover plate fixing face. The rack drive mechanism and the rack drive device installation and fixing face are fixed. Upper gear meshing teeth are formed in one side, facing upwards, of the drive gear bar, and lower gear meshing teeth are formed in one side, facing downwards, of the drive gear bar. The upper gear shaft is supported between the wall plates, an upper gear is fixed to the upper gear shaft, the lower gear shaft is supported between the wall plates, and a lower gear is fixed to the lower gear shaft. The core rod driving clamping and releasing mechanism is connected to the gear drive bar. The core rod vertical synchronous clamping and releasing mechanisms are supported between the wall plates respectively. According to the core rod centering device for the puncher, operation intensity of workers is reduced, the clamping and releasing effect is good, good adaptability to specification changes of core cords is achieved, and punching quality on steel round bar billets by the core cords can be guaranteed.

Description

The plug centring means that punch is used

Technical field

The utility model belongs to steel pipe processing equipment technical field, is specifically related to the plug centring means that a kind of punch is used.

Background technology

The function of punch is by means of plug (industry custom claims that plug is for perforation rod) perforation to the central authorities of the length direction of solid steel pole rod base, after perforation, obtain hollow hollow billet, hollow hollow billet is put to subsequent technique and is rolled into for example steel pipe of required wall thickness of required specification.Technical information about punch can be seen in disclosed Chinese patent literature, as CN2899987Y(seamless steel pipe conical punching machine), CN101652196B(punch and for example), etc.

As is known in the industry, in the process of single solid steel pole rod base being bored a hole at punch, need plug (being aforesaid perforation rod) centering, to prevent plug whipping, affect the perforation quality to steel pole rod base, centering comprises clamping and discharging plug, because because the length of steel pole rod base is longer, therefore generally at the length direction of a side of drawing corresponding to the hollow billet of punch, with interval state, arrange many or claim a plurality of plug centring means, when the hollow billet after being bored a hole by punch marches to first plug centring means, just by this first centring means, plug is discharged and developed into hollow billet is realized to the state of restraining, that said here refers to by plug centring means and had both ensured that hollow billet normal row went out punch hollow billet realization tube bank, do not show again hollow hollow billet and occur excessively vibration situation, at whole tediously long steel pole rod base, complete after perforation, arrive after last plug centring means, all plug centring means all develop into the centering to hollow hollow billet.

As shown in the above description, plug to the process of steel pole rod base perforation in, guarantee that it is very harsh with the requirement of the concentricity of the steel pole rod base center of circle of the excellent base of steel pole (all the time corresponding to).Again, theoretically, connectivity on the plug centring means that the plug centring means of pipe mill is used punch possesses skills, and in disclosed Chinese patent literature, can be seen in equally the technical information of the plug centring means of pipe mill, slightly with exemplify as the centring means of a CN101254510B(rolled steel tube), the core rod holding device of a CN101758074B(pipe mill) and the plug of the plug slew gear of CN102463257A(cold pilger mill automatically fold up device), etc.These patent schemes that are not limited to exemplify are owing to having complex structure, logical fraud to the centering effect shortcoming of plug and bad adaptability that diameter of mandrel is changed, thereby the plug centering during for perforation does not have referential essential meaning.

Typically, as application for a patent for invention publication No. CN102327897A recommends there be " a kind of tappet centering device for perforating machine ", this patent application scheme can be felt relieved plug in perforation procedure, specifically can be referring to 0003 section to 0006 section, its description.But there is following shortcoming in this patent application scheme: one, due to its clamping and discharging and need to realize by a pair of backing roll and coordinating of a hold-down roller plug, and the lifting of a pair of backing roll need be by online assignment personnel the manual operation by handwheel realize (can referring to the 0008th to 0010 section, description), so operator is that workman's manipulation strength is large; Its two, owing to adopting manual operation, therefore the effect of clamping of plug is difficult to meet technological requirement because effect hand-manipulated both changed from the different of workman's individual difference and experience, be subject to again workman's sense of responsibility and even emotional change and affect; Its three, when the specification of the steel pole rod base of needs perforation changes as diameter, need so to change the plug of dimension, so there is the situation to plug specifications vary bad adaptability; They are four years old, owing to plug being clamped under state, a pair of backing roll and corresponding to unavoidably occurring between the hold-down roller on a pair of backing roll top even micro-vast absent-mindedness situation of occurring of not wishing, thereby cause the clamping of plug ineffective, the perforation quality of final impact to steel pole rod base.

In view of above-mentioned prior art, the applicant does lasting and useful exploration, has finally formed technical scheme described below.

Summary of the invention

Task of the present utility model is to provide a kind of and contributes to automatically plug to be clamped or discharge and use the manipulation strength of abandoning manual operation and significantly alleviating workman, be conducive to ensure the ideal clamping of plug and releasing effect are used to the impact of avoiding being subject to manual operation factor, be of value to improving the adaptability of plug specifications vary to use and avoid affect result of use and having the effect of reliably holding under the arm of being convenient to embody to plug to use the plug centring means that ensures that the punch of the quality of boring a hole is used because plug changes.

Task of the present utility model completes like this, the plug centring means that a kind of punch is used, comprise a bedplate, on this bedplate, with the state facing each other, be fixed with a pair of wallboard, and to each formation of the top of wallboard, have a rack drives device that stationary plane and cover plate stationary plane are installed at this; One ，Gai of rack drives mechanism rack drives mechanism and described rack drives device are installed stationary plane and are fixed, and corresponding between a pair of wallboard; One gear drive bar, this gear drive bar is between a pair of wallboard, and be connected with described rack drives mechanism, this gear drive bar towards on a side form the engaging tooth that cogs, and gear drive bar towards under a side form and have lower gear engaging tooth; One cog axle and lower tooth wheel shaft, the axle that cogs is bearing in rotationally between described a pair of wallboard above corresponding to described gear drive bar, and on this cogs axle, being fixed with one cogs, cog and be meshed with the described engaging tooth that cogs, lower tooth wheel shaft is bearing in rotationally between described a pair of wallboard below corresponding to described gear drive bar, and on this lower tooth wheel shaft, be fixed with a lower gear, lower gear is meshed with described lower gear engaging tooth; One plug initiatively folds up mechanism, and this plug initiatively folds up mechanism and is connected on described gear drive bar; On one plug, synchronously fold up under mechanism and a plug and synchronously fold up mechanism, on plug, synchronously fold up mechanism corresponding to described plug, initiatively fold up mechanism above be bearing in rotationally between described a pair of wallboard, and be meshed with described cogging, under plug, synchronously fold up mechanism corresponding to plug, initiatively fold up mechanism below be bearing in rotationally between a pair of wallboard, and be meshed with described lower gear.

In a specific embodiment of the present utility model, described rack drives mechanism comprises acting cylinder holder and acting cylinder, acting cylinder holder is corresponding between described a pair of wallboard, and with described rack drives device, stationary plane being installed fixes, acting cylinder is fixed on acting cylinder holder, the acting cylinder post of this acting cylinder is through acting cylinder holder and be extended with a connecting screw rod, and described gear drive bar is connected with connecting screw rod.

In another specific embodiment of the present utility model, described acting cylinder is oil cylinder or cylinder.

In another specific embodiment of the present utility model, on described gear drive bar and towards one end of described connecting screw rod, offer a connecting screw rod mate with threaded holes, connecting screw rod is threaded with this connecting screw rod mate with threaded holes.

In another specific embodiment of the present utility model, described plug initiatively folds up mechanism and comprises and initiatively fold up roller frame and Centering Roll initiatively, initiatively fold up roller frame and be fixedly connected with described gear drive bar, initiatively Centering Roll is arranged on rotationally and initiatively folds up on roller frame; On described plug, synchronously fold up mechanism and comprise fan-shaped braces axle, upper sector rack, upper fan-shaped braces and upper synchronous Centering Roll, upper fan-shaped braces axle is bearing between described a pair of wallboard rotationally, upper sector rack is fixed on fan-shaped braces axle, and be meshed with described cogging, upper fan-shaped braces is fixed on sector rack axle, and upper synchronous Centering Roll is arranged on fan-shaped braces rotationally; Under described plug, synchronously fold up mechanism and comprise lower fan-shaped braces axle, lower sector rack, lower fan-shaped braces and lower synchronous Centering Roll, lower fan-shaped braces axle is bearing between described a pair of wallboard rotationally, lower sector rack is fixed on lower fan-shaped braces axle, and be meshed with described lower gear, lower fan-shaped braces is fixed on lower fan-shaped braces axle, lower synchronous Centering Roll is arranged on lower fan-shaped braces rotationally, wherein: described active Centering Roll, upper synchronous Centering Roll and lower synchronous Centering Roll form the position relationship of equilateral triangle each other; The position of described upper and lower gear corresponds to each other.

Of the present utility model, also have in a specific embodiment, at described upper sector rack, on the end face of described one end cogging, form have on sector rack engaging tooth, on this, sector rack engaging tooth is meshed with cogging; At described lower sector rack, form and have lower sector rack engaging tooth on the end face of one end of described lower gear, this lower sector rack engaging tooth is meshed with lower gear.

More of the present utility model and in a specific embodiment, be fixed with a cover plate between described a pair of wallboard and in the position corresponding to described cover plate stationary plane.

In of the present utility model and then a specific embodiment, the structure of described upper and lower gear is mutually the same, and the number of teeth and the tooth pitch that are formed in the tooth that cogs on cogging are to be identical with the number of teeth and the tooth pitch that are formed in the lower tooth gear teeth on lower gear.

Of the present utility model again more and in a specific embodiment, the number of teeth of described upper sector rack engaging tooth and tooth pitch are to equate with the number of teeth and the tooth pitch of lower sector rack engaging tooth.

The technical scheme that the utility model provides is owing to driving bar by rack drives mechanism driven gear, when driving plug initiatively to fold up mechanism, gear drive bar drives upper and lower gear, and by upper and lower gear, driven respectively synchronously to fold up on plug and under mechanism and plug, synchronously fold up mechanism, thereby can be automatically to initiatively folding up mechanism at plug, the upper and lower plug synchronously folding up between the three of mechanism of plug is clamped, thereby without alleviating workman's manipulation strength by manual operation; Because the action of clamping or discharging by gear driven mechanism to plug realizes, thereby not only there is the desirable effect that folds up, and can not be subject to any impact of human factor; Because plug initiatively folds up mechanism, the upper and lower mechanism that synchronously folds up of plug can meet the requirement that folds up to the plug of different size, and can ensure all the time the concentricity of plug, thereby there is the good adaptability to plug specifications vary; Due to the reliable grip effect that can guarantee plug, thereby can ensure the perforation quality of plug to steel pole rod base.

Accompanying drawing explanation

Fig. 1 is example structure figure of the present utility model.

Fig. 2 is the partial sectional view of Fig. 1.

Fig. 3 is application examples schematic diagram of the present utility model.

The specific embodiment

For the auditor that the makes Patent Office especially public can be expressly understood technical spirit of the present utility model and beneficial effect more, applicant elaborates the mode with embodiment below, but to the description of embodiment, be not all the restriction to the utility model scheme, any according to the utility model design, done only for pro forma but not substantial equivalent transformation all should be considered as the technical solution of the utility model category.

Please be referring to Fig. 1 and Fig. 2, the bedplate 1 that to have provided a material be metal, and this bedplate 1 is preferably cuboid.The current location status as shown in Figure 1 of take is example, in a side of the long side direction of bedplate 1, be that the left side of state shown in Fig. 1 and the opposite side of long side direction are that the right side of state shown in Fig. 1 is respectively fixed with a wallboard 11, that is to say that wallboard 11 has a pair of, with aspectant state, be fixed on each other left side and the right side of the length direction of bedplate 1.As shown in Figure 1, left side and Ge Yi interval, right side state at the long side direction of bedplate 1 offer one group of wallboard fixing hole 12, and form in the bottom of wallboard 11, there is a wallboard holder 114, in the position corresponding to wallboard fixing hole 12, wallboard 11 is fixing with bedplate 1 with one group of wallboard holder hold-down screw 1141.

On the top of a pair of wallboard 11, each forms has a rack drives device that stationary plane 111 and a cover plate stationary plane 112 are installed, and this rack drives device is installed stationary plane 111 and cover plate stationary plane 112 and also can be called rack drives device fixedly milling flat of milling flat and cover plate is installed fixedly.Owing to maintaining spacing between a pair of wallboard 11, and this spacing also can be regarded as wallboard cavity, therefore for wallboard cavity is implemented to cover, applicant recommends to have a cover plate 113, and this cover plate 113 is fixing corresponding to the position and a pair of wallboard 11 that are preset in the stationary plane screw hole 1121 on cover plate stationary plane 112 by cover plate hold-down screw 1131.Again, in order to ensure the stability between a pair of wallboard 11, therefore showing one group of wall-panels supports screw rod 115(the present embodiment spaced apart has five), wherein one piece of wallboard in one end of each wall-panels supports screw rod 115 and a pair of wallboard 11 is fixed, and another piece of wallboard in the other end of each wall-panels supports screw rod 115 and a pair of wallboard 11 fixed, specifically wall-panels supports screw rod 115 is limited to nut 1151 through the rear employing studdle in the studdle hole 116 on wallboard 11 and limit.

Provide Liao Yi rack drives mechanism 2, this rack drives mechanism 2 comprises an acting cylinder holder 21 and an acting cylinder 22, acting cylinder holder 21 is corresponding between a pair of wallboard 11, and adopt acting cylinder seat hold-down screw 211 that position and a pair of wallboard 11 fixing (install on stationary plane 111 and offer screw hole at rack drives device) of stationary plane 111 are being installed corresponding to aforesaid rack drives device, acting cylinder 22 is fixed on acting cylinder holder 21, the acting cylinder post 221 of this acting cylinder 22 passes acting cylinder holder 21 and is extended with and forms and have a connecting screw rod 2211.As shown in Figure 1, aforesaid rack drives device is installed stationary plane 111 and cover plate stationary plane 112 tilts, and the location status of Fig. 1 of take is example, and rack drives device installation stationary plane 111 recedes, and cover plate stationary plane 112 turns forward, form each other the relation that is similar to ∧ font.

Preferably, aforesaid acting cylinder 22 adopts oil cylinders, yet if use cylinder instead, should be considered as equivalent substitution so and still belong to the disclosed technology contents category of the utility model.

Provided a gear drive bar 3, this gear drive bar 3 is threaded with connecting screw rod 2211 towards one end of aforementioned connecting screw rod 2211, this gear drive bar 3 towards on a side form the engaging tooth 31 that cogs, and gear drive bar 3 towards under a side form and to have lower gear engaging tooth 32, the tooth pitch of upper and lower gear engaging tooth 31,32 is mutually the same, more precisely, the adjacent spacing cogging between engaging tooth 31 be with adjacent lower gear engaging tooth 32 between spacing consistent.

As shown in Figure 2, axial central authorities at aforesaid gear drive bar 3 towards one end of connecting screw rod 2211 offer a connecting screw rod mate with threaded holes 33, along with connecting screw rod 2211 screws in this connecting screw rod mate with threaded holes 33, thereby gear drive bar 3 is realized and being connected of connecting screw rod 2211, and locked by the lock nut 22111 being provided on connecting screw rod 2211.

Please see Fig. 1 by emphasis, one cog axle 4 and gear shaft 5 is once shown, cog axle 4 in the position corresponding to above aforesaid gears driving bar 3 and be located on wallboard 11 by the bearing housing 42(that cogs) be bearing in rotationally between a pair of wallboard 11, on this cogs axle 4, be fixed with one and cog 41, this tooth 411 that cogs cogging on 41 is meshed with the aforesaid engaging tooth 31 that cogs.Lower tooth wheel shaft 5 is located on wallboard 11 in the position corresponding to below gear drive bar 3 and by lower gear bearing housing 52() be bearing in rotationally between a pair of wallboard 11, on this lower tooth wheel shaft 5, be fixed with a lower gear 51, the lower tooth gear teeth 511 on this lower gear 51 are meshed with aforesaid lower gear engaging tooth 32.

Preferably, the axle spacer 43 that cogs is set on the aforesaid axle 4 that cogs, and lower tooth wheel shaft spacer 53 is set on lower tooth wheel shaft 5, and upper and

lower gear

41,51 corresponds to each other.The structure of upper and

lower gear

41,51 is mutually the same, and it is all identical with the number of teeth and the tooth pitch that are formed in the lower tooth gear teeth 511 on lower gear 51 to be formed in the number of teeth and the tooth pitch of the tooth 411 that cogs on 41 that cogs.

Provide a plug and initiatively folded up mechanism 6, this plug initiatively folds up mechanism 6 and comprises that one initiatively folds up initiatively Centering Roll 62 of roller frame 61 and, initiatively folding up roller frame 61 is fixedly connected with aforesaid gear drive bar 3 one end away from connecting screw rod 2211, here the alleged concept being fixedly connected with refers to that initiatively folding up roller frame 61 is configured to integrative-structure with gear drive bar 3, and initiatively Centering Roll 62 is bearing in rotationally and is initiatively folded up on roller frame 61 by the roll shaft 21 of initiatively feeling relieved.

Provided and on a plug, synchronously folded up mechanism 7, on this plug, synchronously fold up mechanism 7 and comprise fan-shaped braces axle 71, upper sector rack 72, upper fan-shaped braces 73 and upper synchronous Centering Roll 74, one end and the other end of upper fan-shaped braces axle 71 are respectively bearing between a pair of wallboard 11 rotationally by the upper fan-shaped braces bearing housing 711 being arranged on a pair of wallboard 11, upper sector rack 72 is welded on fan-shaped braces axle 71, and the upper sector rack engaging tooth 721 on this on sector rack 72 is meshed with the aforesaid tooth 411 that cogs cogging on 41, upper fan-shaped braces 73 is fixed on upper fan-shaped braces axle 71 with welding manner equally, upper synchronous Centering Roll 74 is supported and is arranged on shortly on upper fan-shaped braces 73 rotationally by upper synchronous centering roll shaft 741.

Provided and under a plug, synchronously folded up mechanism 8, under this plug, synchronously fold up mechanism 8 and comprise lower fan-shaped braces axle 81, lower sector rack 82, lower fan-shaped braces 83 and lower synchronous Centering Roll 84, one end and the other end of lower fan-shaped braces axle 81 are respectively bearing between a pair of wallboard 11 rotationally by the lower fan-shaped braces bearing housing 811 being arranged on a pair of wallboard 11, lower sector rack 82 is welded on lower fan-shaped braces axle 81, and the lower sector rack engaging tooth 821 on this lower sector rack 82 is meshed with the lower tooth gear teeth 511 under aforesaid lower gear 51, lower fan-shaped braces 83 is fixed on lower fan-shaped braces axle 81 with welding manner equally, lower synchronous Centering Roll 84 is supported and is arranged on shortly on lower fan-shaped braces 83 rotationally by lower synchronous centering roll shaft 841.

The number of teeth and the tooth pitch that are formed in the upper sector rack engaging tooth 721 on aforesaid upper sector rack 72 are to equate with the number of teeth and the tooth pitch that are formed in the lower sector rack engaging tooth 821 on lower sector rack 82.

Preferably, corresponding to the aforesaid position that cogs bearing housing 42, be screwed a bearing block protecting cover 421, the bearing 422 being cogged on bearing housing 42 by 421 pairs of this bearing block protecting covers covers and protects, for aforesaid lower gear bearing housing 52, upper fan-shaped braces bearing housing 711 and the same example of lower fan-shaped braces bearing housing 811.

Refer to Fig. 3 and in conjunction with Fig. 1 and Fig. 2, applicant describes operation principle of the present utility model, figure 3 illustrates punch 9 and a mandrel trolley 10, between punch 9 and mandrel trolley 10, be provided with quantity and be not limited to illustrate the plug centring means that quantity (quadruplet) the utility model punch is used, and between the plug centring means of using at adjacent punch, be equipped with a holder protection unit 20.

Under punch 9 is in running order, at 30 pairs of steel pole rod bases 40 of plug as shown in Figure 3, implement in the process of perforation, the plug centring means of being used by the utility model punch is to plug 30 centering, specifically: by Fig. 1 and Fig. 2, shown, acting cylinder 22 work of rack drives mechanism 2, acting cylinder post 221 stretches outside the cylinder body of acting cylinder 22, connecting screw rod 2211 driven gears by acting cylinder post 221 drive bar 3 forwards to stretch or claim forwards displacement, due to upper,

lower gear

41, 51 respectively with upper, lower gear engaging tooth 31, 32 are meshed, therefore when forwards displacement of gear drive bar 3, by its drive, cog 41 to clockwise motion, drive lower gear 51 to counterclockwise motion simultaneously, again because the upper sector rack engaging tooth 721 synchronously folding up on plug on the upper sector rack 72 of mechanism 7 is meshed with the tooth 411 that cogs, and the lower sector rack mesh plate 821 that synchronously folds up the lower sector rack 82 of mechanism 8 under plug is meshed with the lower tooth gear teeth 511, thereby by sector rack 72 in 41 drives that cog to counter clockwise direction displacement, by lower gear 51, drive lower sector rack 82 to clockwise direction displacement.Along with upper sector rack 72 is to clockwise direction displacement, make synchronous Centering Roll 74 towards plug, initiatively fold up the direction motion of the active Centering Roll 62 of mechanism 6, simultaneously with lower sector rack 82 to counter clockwise direction displacement, make lower synchronous Centering Roll 84 towards the direction motion of active Centering Roll 62, that is to say, initiatively Centering Roll 62, upper and lower

synchronous Centering Roll

74,84 threes draw in opposite directions and plug 30 are clamped, otherwise with example.Hence one can see that, and initiatively the effect of the bearing that plug 30 is limited has been played in fact in Centering Roll 62, upper and lower

synchronous Centering Roll

74,84 threes' cooperation, and plug 30 can only move under centering under their control.Again, known as shown in Figure 3, for example, when having completed the steel pole rod base 40 of perforation and develop into hollow billet and arrive at the position of the plug centring means that corresponding the utility model punch uses (two of the left side of Fig. 3 location status centring means), so just hollow billet (completing the pipe after perforation) is implemented to centering.And, known as shown in Figure 2, aforesaid active Centering Roll 62, upper synchronous Centering Roll 74 and lower synchronous Centering Roll 84 threes' position forms the position relationship of equilateral triangle, and initiatively the matching relationship between Centering Roll 62, upper and lower

synchronous Centering Roll

74,84 threes just as the matching relationship of gathering with scolding out of three fingers of people.

In sum, the technical scheme that the utility model provides has overcome the shortcoming in prior art, has successfully completed invention task, has embodied objectively the technique effect referring in the superincumbent technique effect of applicant hurdle.

Claims

1. the plug centring means that a kind of punch is used, it is characterized in that comprising a bedplate (1), at this bedplate (1), above with the state facing each other, be fixed with a pair of wallboard (11), and to each formation of the top of wallboard (11), have a rack drives device that stationary plane (111) and cover plate stationary plane (112) are installed at this; One ，Gai rack drives mechanism of rack drives mechanism (2) (2) installs stationary plane (111) with described rack drives device and fixes, and corresponding between a pair of wallboard (11); One gear drive bar (3), this gear drive bar (3) is positioned between a pair of wallboard (11), and be connected with described rack drives mechanism (2), at this gear drive bar (3), towards a upper side, form the engaging tooth (31) that cogs, and gear drive bar (3) towards under a side form and have lower gear engaging tooth (32); one cog axle (4) and lower tooth wheel shaft (5), the axle (4) that cogs is bearing between described a pair of wallboard (11) rotationally in the top corresponding to described gear drive bar (3), and on this axle that cogs (4), be fixed with one cog (41), cog (41) with described in the engaging tooth (31) that cogs be meshed, lower tooth wheel shaft (5) is bearing between described a pair of wallboard (11) rotationally in the below corresponding to described gear drive bar (3), and be fixed with a lower gear (51) on this lower tooth wheel shaft (5), lower gear (51) is meshed with described lower gear engaging tooth (32), one plug initiatively folds up mechanism (6), and this plug initiatively folds up mechanism (6) and is connected on described gear drive bar (3), on one plug, synchronously fold up and under mechanism (7) and a plug, synchronously fold up mechanism (8), on plug, synchronously folding up mechanism (7) is bearing between described a pair of wallboard (11) rotationally in the top that initiatively folds up mechanism (6) corresponding to described plug, and be meshed with described cogging (41), under plug, synchronously fold up mechanism (8) and be bearing in rotationally between a pair of wallboard (11) in the below that initiatively folds up mechanism (7) corresponding to plug, and be meshed with described lower gear (51).

2. the plug centring means that punch according to claim 1 is used, it is characterized in that described rack drives mechanism (2) comprises acting cylinder holder (21) and acting cylinder (22), acting cylinder holder (21) is corresponding between described a pair of wallboard (11), and with described rack drives device, stationary plane (111) being installed fixes, acting cylinder (22) is fixed on acting cylinder holder (21), the acting cylinder post (221) of this acting cylinder (22) is through acting cylinder holder (21) and be extended with a connecting screw rod (2211), described gear drive bar (3) is connected with connecting screw rod (2211).

3. the plug centring means that punch according to claim 2 is used, is characterized in that described acting cylinder (22) is oil cylinder or cylinder.

4. the plug centring means that punch according to claim 2 is used, it is characterized in that upper at described gear drive bar (3) and towards one end of described connecting screw rod (2211), offer a connecting screw rod mate with threaded holes (33), connecting screw rod (2211) is threaded with this connecting screw rod mate with threaded holes (33).

5. the plug centring means that punch according to claim 1 is used, it is characterized in that described plug initiatively folds up mechanism (6) and comprises and initiatively fold up roller frame (61) and active Centering Roll (62), initiatively fold up roller frame (61) and be fixedly connected with described gear drive bar (3), initiatively Centering Roll (62) is arranged on rotationally and initiatively folds up on roller frame (61), on described plug, synchronously fold up mechanism (7) and comprise fan-shaped braces axle (71), upper sector rack (72), upper fan-shaped braces (73) and upper synchronous Centering Roll (74), upper fan-shaped braces axle (71) is bearing between described a pair of wallboard (11) rotationally, upper sector rack (72) is fixed on fan-shaped braces axle (71), and be meshed with described cogging (41), it is upper that upper fan-shaped braces (73) is fixed on sector rack axle (71), and upper synchronous Centering Roll (74) is arranged on fan-shaped braces (73) rotationally, under described plug, synchronously fold up mechanism (8) and comprise lower fan-shaped braces axle (81), lower sector rack (82), lower fan-shaped braces (83) and lower synchronous Centering Roll (84), lower fan-shaped braces axle (81) is bearing between described a pair of wallboard (11) rotationally, lower sector rack (82) is fixed on lower fan-shaped braces axle (81), and be meshed with described lower gear (51), lower fan-shaped braces (83) is fixed on lower fan-shaped braces axle (71), lower synchronous Centering Roll (84) is arranged on lower fan-shaped braces (83) rotationally, wherein: described active Centering Roll (62), upper synchronous Centering Roll (74) and lower synchronous Centering Roll (84) form the position relationship of equilateral triangle each other, the position of described upper and lower gear (41,51) corresponds to each other.

6. the plug centring means that punch according to claim 5 is used, it is characterized in that forming and having upper sector rack engaging tooth (721) on the end face of one end of described cogging (41) at described upper sector rack (72), on this, sector rack engaging tooth (721) is meshed with cog (41); At described lower sector rack (82), on the end face of one end of described lower gear (51), form and have lower sector rack engaging tooth (821), this lower sector rack engaging tooth (821) is meshed with lower gear (51).

7. the plug centring means that punch according to claim 1 is used, is characterized in that being fixed with a cover plate (113) between described a pair of wallboard (11) and in the position corresponding to described cover plate stationary plane (112).

8. the plug centring means of using according to the punch described in claim 1 or 5 or 6, the structure that it is characterized in that described upper and lower gear (41,51) is mutually the same, and the number of teeth and the tooth pitch that are formed in the tooth that cogs (411) cogging on (41) are to be identical with the number of teeth and the tooth pitch that are formed in the lower tooth gear teeth (511) on lower gear (51).

9. the plug centring means that punch according to claim 6 is used, is characterized in that the number of teeth and the tooth pitch of described upper sector rack engaging tooth (721) is to equate with the number of teeth and the tooth pitch of lower sector rack engaging tooth (821).