CN207942475U - A kind of hole punched device and multistation perforating press - Google Patents

Abstract

The utility model discloses a kind of hole punched device and multistation perforating press, belong to leather processing field.The hole punched device includes：Cylinder, stamping knife connecting rod, stamping knife pressing plate, rotation drive rod, stamping knife and driven wheel；Cylinder has piston rod, outside the equal stretches out cylinder of piston rod upper and lower ends；The upper end of piston rod and stamping knife connecting rod is all connected with stamping knife pressing plate, and stamping knife connecting rod can be relative to stamping knife press plate rotary；Stamping knife is installed on stamping knife connecting rod lower end；Driven wheel includes the gear teeth and axle sleeve；The gear teeth are distributed along axle sleeve external circumferential；Axle sleeve is sleeved on stamping knife connecting rod lower part, axially disposed at least one sliding slot on axle sleeve, and rotation drive rod one end is located in sliding slot, and the other end is fixed on stamping knife connecting rod.At work, stamping knife swivel feeding is carried out at the same time the device with punching press feeding, punching thickness higher is enabled to, according to different materials highest punching thickness up to 15 millimeters.Multiple devices are combined into multistation perforating press, you can realize that multistation is processed simultaneously, improve efficiency.

Description

A kind of hole punched device and multistation perforating press

Technical field

The utility model belongs to leather processing field, more particularly, to a kind of hole punched device and multistation perforating press.

Background technology

Contemporary scientific rapid technological improvement, market competition are growing more intense, and ubiquitous, product quality is competed in modern society It is that ensure that enterprise establishes oneself in an unassailable position in fierce market competition basic with yield.Currently, in the production of leather and fur products Cheng Zhong, leather cutting machine can only be punched out the conventional leather less than 3 mm of thickness, and can only once rush single or double Hole, this punching speed is slow, and efficiency is low, of high cost, and the scope of application is small, and technology is difficult to meet the requirement of client.

Utility model content

For the disadvantages described above or Improvement requirement of the prior art, the utility model provides a kind of hole punched device, purpose It is, by improving transmission mechanism, so that cutter head is carried out punching press while rotating, promote punching thickness, thus solve the prior art The thin technical problem of middle punching.The utility model additionally provides a kind of multistation perforating press, it is intended that multiple punchings are filled It sets and is combined, realize multiplexing bit manipulation, thus solve the technical problem that punching efficiency is low in the prior art.

To achieve the above object, according to the one side of the utility model, a kind of hole punched device is provided, including：Cylinder, Stamping knife connecting rod, stamping knife pressing plate, rotation drive rod, stamping knife and driven wheel；

Cylinder has piston rod, outside the equal stretches out cylinder of piston rod upper and lower ends；Piston rod is arranged in parallel with stamping knife connecting rod, living The upper end of stopper rod and stamping knife connecting rod is all connected with stamping knife pressing plate, and stamping knife connecting rod can be rotation axis using own axes relative to punching Knife press plate rotary；Stamping knife is installed on stamping knife connecting rod lower end；

Driven wheel includes the gear teeth and axle sleeve；The gear teeth are distributed along axle sleeve external circumferential；Axle sleeve is sleeved on stamping knife connecting rod lower part, axle sleeve Upper axially disposed at least one sliding slot, rotation drive rod one end are located in sliding slot, and the other end is fixed on stamping knife connecting rod.

Further, which includes stamping knife compression spring；Axle sleeve is that up big and down small multi-diameter shaft constructs, and is set inside axle sleeve There is up big and down small stepped hole；The gear teeth are set to axle sleeve big end, and sliding slot is set to axle sleeve small end；Axle sleeve lower part is inserted into stamping knife connecting rod lower end Aperture in, and can freely up and down be moved in aperture；Stamping knife compression spring upper end is withstood in the lateral protrusions on stamping knife connecting rod top, punching Knife compression spring lower end withstands on the macropore bottom surface of axle sleeve stepped hole.

Further, which includes shaft and shaft bearing；Shaft bearing is installed on stamping knife connecting rod top, shaft Upper end is set in the swivelling chute of stamping knife pressing plate lower surface, and shaft lower end is set in shaft bearing.

Further, drive rod bearing is equipped in sliding slot, for supporting rotation drive rod and existing with rotation drive rod It is moved up and down in sliding slot.

Further, which includes binder foot, binder guide rod and binder compression spring；Binder footmuff is under piston rod Portion, and can move up and down in underpart of the piston rod；Binder guide rod is arranged in parallel with piston rod, and binder foot is fixed under binder guide rod On, to coordinate the plane of movement of limitation binder foot with piston rod；Underpart of the piston rod is equipped with baffle ring, and baffle ring is located above binder foot； The upper end of binder compression spring is withstood on baffle ring, and the lower end of binder compression spring is withstood on binder foot.

Further, which includes stamping knife guide sleeve, stamping knife pull rod and stamping knife collet chuck；Stamping knife connecting rod lower end is equipped with outer Screw thread；It is that up big and down small stepped hole constructs inside stamping knife guide sleeve, upper end macropore is threaded hole, is used for and stamping knife connecting rod lower end External screw thread docks；Stamping knife pull rod is hexagon socket head cap screw, including nut and stud, nut be located in the macropore inside stamping knife guide sleeve, Stud is located in the aperture inside stamping knife guide sleeve；Aperture lower end inside stamping knife guide sleeve is conical mouths；The foreign steamer of stamping knife collet chuck Exterior feature matches with conical mouths, and the top of stamping knife collet chuck is equipped with threaded hole, for coordinating with the stud of stamping knife pull rod；Stamping knife collet chuck Lower part for stamping knife to be clamped.

Further, which includes ball sleeve, the ball bushing being sequentially sleeved in from inside to outside outside stamping knife guide sleeve With guide sleeve seat；Fixation is set at guide sleeve seat, and ball bushing is fixed on inside guide sleeve seat, and the side wall of ball sleeve is equipped with ball, ball one Side is contacted with ball bushing inner surface, and the other side is contacted with stamping knife guide sleeve outer surface.

To achieve the goals above, on the other hand, the utility model provides a kind of multistation perforating press, including at least two A as above hole punched device described in any one section.

Further, which includes knife stamping holder, and knife stamping holder is equipped at least two tie rod holes；Each hole punched device Stamping knife connecting rod correspond be set to each tie rod holes in；

The cylinder of each hole punched device includes cylinder-bore, upper end cover and bottom end cover；Cylinder-bore is set on knife stamping holder, upper end Lid and bottom end cover are respectively sealed in cylinder-bore top and bottom；

Piston rod includes upper boom, lower beam and the piston being fixed between upper boom and lower beam；The inner wall of piston and cylinder-bore It is slidingly sealed, upper boom passes through upper end cover and is slidingly sealed with upper end cover, and lower beam passes through bottom end cover and is slidingly sealed with bottom end cover；

Cylinder-bore inner wall is equipped with the air admission hole being located above piston and the venthole below piston.

Further, which includes motor, driving wheel, transmission belt, stamping knife seat board and solenoid valve；

Driving wheel is installed on the output shaft of motor, and the driven wheel of each hole punched device is connect by transmission belt with driving wheel；

Stamping knife seat board is equipped with the gas passage for being separately connected each air admission hole, each venthole, and solenoid valve is for controlling each gas The break-make in body channel, to control piston rod movement.

In general, the utility model is contemplated above technical scheme is compared with the prior art, can obtain down and show Beneficial effect：

1, stamping knife rotational structure and pneumatic feeding structure are combined due to the utility model, when work, stamping knife swivel feeding It is carried out at the same time with punching press feeding, punching thickness higher is enabled to, according to different materials highest punching thickness up to 15 millimeters；

2, directly lifting stamping knife cylinder only using stamping knife compression spring need to start in undershoot, greatly save the energy；

3, stamping knife small end is connected by shaft and shaft bearing with stamping knife pressing plate, is dropped significantly when stamping knife pressing plate pushes The low rotational resistance of stamping knife connecting rod promotes rotation punching performance；

4, the sliding friction rotated between drive rod and sliding slot is converted into rolling friction using drive rod bearing, can subtracted Slow abrasion, promotes service life, and can reduce ram drag, promotes punching performance；

5, material is taken up when setting binder foot can rise to avoid stamping knife, improves processing efficiency and qualification rate；Binder compression spring On the one hand can in punching course and stamping knife leave leather before ensure that binder foot press on material, on the other hand can coordinate Stamping knife compression spring lifts together stamping knife；Binder guide rod is arranged in parallel with piston rod, ensures that binder foot will not inflection point；

6, the aperture lower end inside stamping knife guide sleeve is conical mouths, and outer profile and the conical mouths of stamping knife collet chuck match, The top of stamping knife collet chuck is equipped with threaded hole, and for coordinating with the stud of stamping knife pull rod, the lower part of stamping knife collet chuck is for being clamped stamping knife； So design can utilize stamping knife pull rod to tense stamping knife collet chuck, to make stamping knife collet chuck clamp stamping knife under conical mouths extruding, Realize fast assembling-disassembling stamping knife；

7, on the one hand ball sleeve, ball bushing and guide sleeve seat can limit the space of stamping knife guide sleeve, it is ensured that stamping knife is led Set moves up and down as linear motion；On the other hand, sliding friction is converted into rolling friction using ball, substantially reduces stamping knife and leads Resistance set rotation and moved up and down promotes rotation punching performance；

8, more than two hole punched devices are combined, then can once rushes more than two holes, and since stamping knife is dismantled and assembled It replaces, can also rush the hole of different pore size simultaneously as needed；

9, air cavity of the cylinder-bore as cylinder is directly opened up on knife stamping holder, and the piston rod of stamping knife device is mounted on should In cylinder-bore, to which cylinder and knife stamping holder be become one, more compact structure, occupied space smaller；

10, using the driven wheel of transmission band connection driving wheel and each hole punched device, each stamping knife synchronous rotary can be made；And it is sharp With each each piston rod movement of solenoid valve independent control, stamping knife is replaced in cooperation, then any amount, arbitrary can be realized according to different demands The synchronous rotary punching processing of position, arbitrary aperture.

Description of the drawings

Fig. 1 is hole punched device assembling figure；

Fig. 2 is four station punching machine assembling figures；

Fig. 3 is the vertical view of Fig. 2；

Fig. 4 is the A-A sectional views of Fig. 3；

Fig. 5 is the local I enlarged drawing of Fig. 4；

Fig. 6 is the local I I enlarged drawings of Fig. 4；

Fig. 7 is the local I II enlarged drawings of Fig. 4；

Fig. 8 is six station punching machine assembling figures；

Fig. 9 is the vertical view of Fig. 4.

In all the appended drawings, identical reference numeral is used for indicating identical element or structure, wherein：

1- punching assemblies

11- lifting nut 12- piston rod 121- upper booms

Hexagonal screw rod in 122- lower beam 123- baffle rings 124-

13- upper end cover 131- upper end cover closing disk 132- upper end cover sealing rings

133- upper end cover axle envelope 14- piston 141- piston onlies

142- piston seal 15- bottom end cover 151- bottom end cover closing disks

152- bottom end cover axle envelope 153- bottom end cover sealing ring 154- bottom end cover cushion pads

16- stamping knife pressing plate 17- stamping knife connecting rods 171- rotates drive rod

172- drive rod bearing 173- threaded hole 174- shafts

175- shaft bearing 176- shaft stop nut 18- stamping knife compression springs

19- stamping knives

2- rotary components

21- driven wheel 211- gear teeth 212- axle sleeves

213- sliding slot 22- upper bearing (metal) 23- lower bearings

24- guide sleeve seat 25- stamping knife pull rod 26- ball bushings

27- ball sleeve 28- stamping knife guide sleeve 29- stamping knife collet chucks

3- binder components

31- binder foot 311- gasket 32- binders hole

33- binder compression spring 34- binder guide rod 35- dry type bearings

4- knife stamping holders

41- cylinder-bore 42- air admission hole 43- ventholes

5- rotary drive assemblies

51- motor 52- driving wheel 53- transmission belts

6- stamping knife seat board 7- solenoid valves

Specific implementation mode

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.In addition, institute in the various embodiments of the present invention described below The technical characteristic being related to can be combined with each other as long as they do not conflict with each other.

Fig. 1~7 are the first embodiment of the utility model.The first embodiment of the utility model be a kind of hole punched device with And four station punching machines being made of the hole punched device.

If the hole punched device of Fig. 1~3, the utility model includes punching assembly 1, rotary components 2, binder component 3, this practicality Four novel station punching machines include four hole punched devices and knife stamping holder 4, rotary drive assembly 5, stamping knife seat board 6, solenoid valve 7。

Please refer to Fig. 1, punching assembly 1 include lifting nut 11, piston rod 12, upper end cover 13, piston 14, bottom end cover 15, Stamping knife pressing plate 16, stamping knife connecting rod 17, stamping knife compression spring 18, stamping knife 19.There is cylinder piston rod 12,12 upper and lower ends of piston rod to stretch Go out outside cylinder；Piston rod 12 is arranged in parallel with stamping knife connecting rod 17, and piston rod 12 and the upper end of stamping knife connecting rod 17 are all connected with stamping knife pressure Plate 16, and stamping knife connecting rod 17 can be rotated using own axes as rotation axis relative to stamping knife pressing plate 16；Stamping knife 19 is installed on punching 17 lower end of knife connecting rod.

Fig. 4 and Fig. 5 are please referred to, piston rod 12 includes upper boom 121, lower beam 122, baffle ring 123, interior hexagonal screw rod 124.Upper end Lid 13 includes upper end cover closing disk 131, upper end cover sealing ring 132, upper end cover axle envelope 133.Piston 14 includes piston only 141, lives Fill in seal 142.Bottom end cover 15 includes bottom end cover closing disk 151, bottom end cover axle envelope 152, bottom end cover sealing ring 153, bottom end cover buffering Pad 154.Knife stamping holder 4 includes cylinder-bore 41, air admission hole 42, venthole 43 and tie rod holes (not labeled).

The upper end cover of this implementation is identical as bottom end cover structure, in order to show that the construction of upper end cover closing disk 131, Fig. 5 omit Upper end cover cushion pad.Upper end cover cushion pad and 154 one side of bottom end cover cushion pad avoid piston only 141 and upper end cover closing disk 131, bottom end cover closing disk 151 directly bumps against, and air admission hole 42 is blocked when piston only 141 on the other hand being avoided to move to extreme position Or venthole 43.

Please refer to Fig. 4, Fig. 6 and Fig. 7, rotary components 2 include driven wheel 21, upper bearing (metal) 22, lower bearing 23, guide sleeve seat 24, Stamping knife pull rod 25, ball bushing 26, ball sleeve 27, stamping knife guide sleeve 28, stamping knife collet chuck 29.Stamping knife connecting rod 17 includes rotation drive rod 171, drive rod bearing 172, threaded hole 173, shaft 174, shaft bearing 175, shaft stop nut 176.

Driven wheel 21 includes the gear teeth 211 and axle sleeve 212；The gear teeth 211 are distributed along 212 external circumferential of axle sleeve；Axle sleeve 212 is sleeved on 17 lower part of stamping knife connecting rod, an axially disposed sliding slot 213 on axle sleeve 212 (can be arranged in other embodiments two about The sliding slot 213 of the axisymmetrical of axle sleeve 212), 171 one end of rotation drive rod is located in sliding slot, and the other end is fixed on stamping knife connecting rod On 17.

The stamping knife connecting rod 17 of each hole punched device, which corresponds, to be set in each tie rod holes.Upper end cover 13 and bottom end cover 15 lead to respectively It crosses upper end cover sealing ring 132 and bottom end cover sealing ring 153 is sealed in 41 top and bottom of cylinder-bore.Piston only 141 and cylinder The inner wall in hole 41 is slidingly sealed by piston seal 142, and upper boom 121 passes through upper end cover 13 and passes through upper end cover axis with upper end cover 13 Envelope 133 is slidingly sealed, and lower beam 122 passes through bottom end cover 15 and is slidingly sealed by bottom end cover axle envelope 152 with bottom end cover 15.Cylinder-bore 41 inner walls are equipped with the air admission hole 42 for being located at 14 top of piston and the venthole 43 positioned at 14 lower section of piston.

Fig. 3 and Fig. 5 are please referred to, driving wheel 52 is installed on the output shaft of motor 51, and transmission belt 53 is by each hole punched device Driven wheel 21 is connect with driving wheel 52.Stamping knife seat board 6 is equipped with and is separately connected each air admission hole 42, the gas of each venthole 43 leads to Road, each solenoid valve 7 are used for the break-make of each gas passage of independent control, to independent control piston rod movement.In the present embodiment, The trend of transmission belt 53 is adjusted by two fixed pulley (not labeled), increases the contact of transmission belt 53 and driven wheel 21 as much as possible Area, to promote driving force and stability.

When work, for the material of different-thickness, by the regulation motor speed of mainshaft and cylinder pressure change stamping knife is adjusted Rotary speed and punching press feed speed so that punching thickness higher.Through testing the difference according to selected rapidoprint, most High punching thickness is up to 15 millimeters.

The course of work of the present embodiment is as follows：

1, start motor 51, drive four driven wheels 21 to rotate synchronously by transmission belt 53, the axle sleeve 212 of driven wheel 21 is logical It crosses sliding slot 213 to drive shaft bearing 175 and then drive shaft 174, shaft 174 drives stamping knife connecting rod 17 to rotate, stamping knife connecting rod 17 Pass sequentially through stamping knife guide sleeve 28, stamping knife collet chuck 29 drives stamping knife 19 to rotate synchronously；

2, the gas passage of four solenoid valve independent controls, four cylinders, compressed air are logical by the gas of stamping knife seat board 6 Road is divided into four tunnels and reaches four cylinder-bores 41, and then four piston rods 12 of independent control, four piston rods 12 drive respectively respectively The stamping knife pressing plate 16 of connection moves, and pushes corresponding stamping knife connecting rod 17 by stamping knife pressing plate 16, stamping knife connecting rod 17 leads to successively Cross stamping knife guide sleeve 28, stamping knife collet chuck 29 drives stamping knife 19 to be punched out.

It usually can be according to actual processing demand, by programmable controller (such as PLC, MCU) according to default processing journey Four solenoid valves of sequence independent control select the punching nearby of suitable stamping knife according to the pore size of setting.

In punch process, compressed gas reaches four cylinders promotions, four piston rods 14 fortune downwards by being divided into four tunnels Dynamic, binder compression spring 33 pushes binder foot 31 to move downward until pushing down leather substance at this time, and lower beam 122 continues to move downward, pressure Material compression spring 33 compressed, while upper boom 121 drive top stamping knife pressing plate 16, make stamping knife connecting rod 17 push, drive stamping knife 19 into Row punching, and stamping knife compression spring 18 is made to be also at compressive state.Compressed air disconnects after punching, stamping knife compression spring 18 and binder pressure Spring 33 resets, and piston rod 12 and stamping knife connecting rod 17 are jacked up.And before binder compression spring 33 restores initial length, binder compression spring 33 Binder foot 31 can be pressed on leather substance always in order to avoid being taken up by stamping knife 19, until stamping knife 19 is detached from leather substance and binder pressure Spring 33 restores initial length, and lower beam 122 can just be lifted binder foot 31 by gasket 311.Final stamping knife 19 and binder foot 31 are equal It resets.Binder foot 31 pushes down leather substance in punching overall process, ensures punching quality.

Fig. 8,9 are please referred to, are the second embodiment of the utility model, is a kind of six station punching machines, implements with first Difference lies in increase two hole punched devices, the concatenate rule of other elements, mode of operation are homogeneous to four station punching machines of example Together, the course of work and principle are also identical.

The multistation perforating press of (not shown) in other embodiments, the utility model can be in first embodiment and second On the basis of embodiment, by additions and deletions hole punched device, realize three stations to the Combined machining of arbitrary multistation.

As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not To limit the utility model, any modification made within the spirit and principle of the present invention, equivalent replacement and change Into etc., it should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of hole punched device, which is characterized in that including：Cylinder, stamping knife connecting rod, stamping knife pressing plate, rotation drive rod, stamping knife and from Driving wheel；

Cylinder has piston rod, outside the equal stretches out cylinder of piston rod upper and lower ends；Piston rod is arranged in parallel with stamping knife connecting rod, piston rod It is all connected with stamping knife pressing plate with the upper end of stamping knife connecting rod, and stamping knife connecting rod can be rotation axis using own axes relative to stamping knife pressure Plate rotates；Stamping knife is installed on stamping knife connecting rod lower end；

Driven wheel includes the gear teeth and axle sleeve；The gear teeth are distributed along axle sleeve external circumferential；Axle sleeve is sleeved on stamping knife connecting rod lower part, axle sleeve upper edge Axial that at least one sliding slot is arranged, rotation drive rod one end is located in sliding slot, and the other end is fixed on stamping knife connecting rod.

2. hole punched device as described in claim 1, which is characterized in that including stamping knife compression spring；Axle sleeve is up big and down small ladder Axis constructs, and axle sleeve is internally provided with up big and down small stepped hole；The gear teeth are set to axle sleeve big end, and sliding slot is set to axle sleeve small end；Stamping knife connects Bar lower end is inserted into the aperture of axle sleeve lower part, and can freely up and down be moved in aperture；Stamping knife compression spring upper end withstands on stamping knife connecting rod In the lateral protrusions on top, stamping knife compression spring lower end withstands on the macropore bottom surface of axle sleeve stepped hole.

3. hole punched device as described in claim 1, which is characterized in that including shaft and shaft bearing；Shaft bearing is installed on Stamping knife connecting rod top, shaft upper end are set in the swivelling chute of stamping knife pressing plate lower surface, and shaft lower end is set in shaft bearing.

4. the hole punched device as described in claims 1 to 3 any one, which is characterized in that be equipped with drive rod bearing in sliding slot, use It is moved up and down in sliding slot in bearing rotation drive rod and with rotation drive rod.

5. the hole punched device as described in claims 1 to 3 any one, which is characterized in that including binder foot, binder guide rod and pressure Expect compression spring；Binder footmuff can move up and down in underpart of the piston rod in underpart of the piston rod；Binder guide rod is parallel with piston rod to be set It sets, is fixed under binder guide rod on binder foot, to coordinate the plane of movement of limitation binder foot with piston rod；Underpart of the piston rod is equipped with Baffle ring, baffle ring are located above binder foot；The upper end of binder compression spring is withstood on baffle ring, and the lower end of binder compression spring is withstood on binder foot.

6. the hole punched device as described in claims 1 to 3 any one, which is characterized in that including stamping knife guide sleeve, stamping knife pull rod and Stamping knife collet chuck；Stamping knife connecting rod lower end is equipped with external screw thread；It is that up big and down small stepped hole constructs inside stamping knife guide sleeve, upper end macropore is Threaded hole, for being docked with the external screw thread of stamping knife connecting rod lower end；Stamping knife pull rod is hexagon socket head cap screw, including nut and stud, spiral shell Cap is located in the macropore inside stamping knife guide sleeve, and stud is located in the aperture inside stamping knife guide sleeve；Under aperture inside stamping knife guide sleeve End is conical mouths；The outer profile of stamping knife collet chuck matches with conical mouths, and the top of stamping knife collet chuck is equipped with threaded hole, for The stud of stamping knife pull rod coordinates；The lower part of stamping knife collet chuck is for being clamped stamping knife.

7. hole punched device as claimed in claim 6, which is characterized in that including being sequentially sleeved in from inside to outside outside stamping knife guide sleeve Ball sleeve, ball bushing and guide sleeve seat；Fixation is set at guide sleeve seat, and ball bushing is fixed on inside guide sleeve seat, the side wall of ball sleeve Equipped with ball, ball side is contacted with ball bushing inner surface, and the other side is contacted with stamping knife guide sleeve outer surface.

8. a kind of multistation perforating press, which is characterized in that including at least two rushing as described in claim 1~7 any one Aperture apparatus.

9. multistation perforating press as claimed in claim 8, which is characterized in that including knife stamping holder, knife stamping holder is equipped at least two Tie rod holes；The stamping knife connecting rod of each hole punched device, which corresponds, to be set in each tie rod holes；

The cylinder of each hole punched device includes cylinder-bore, upper end cover and bottom end cover；Cylinder-bore be set to knife stamping holder on, upper end cover and Bottom end cover is respectively sealed in cylinder-bore top and bottom；

Piston rod includes upper boom, lower beam and the piston being fixed between upper boom and lower beam；Piston and the inner wall of cylinder-bore slide Sealing, upper boom pass through upper end cover and are slidingly sealed with upper end cover, and lower beam passes through bottom end cover and is slidingly sealed with bottom end cover；

Cylinder-bore inner wall is equipped with the air admission hole being located above piston and the venthole below piston.

10. multistation perforating press as claimed in claim 8, which is characterized in that including motor, driving wheel, transmission belt, knife stamping holder Plate and solenoid valve；

Driving wheel is installed on the output shaft of motor, and the driven wheel of each hole punched device is connect by transmission belt with driving wheel；

Stamping knife seat board is equipped with the gas passage for being separately connected each air admission hole, each venthole, and solenoid valve is logical for controlling each gas The break-make in road, to control piston rod movement.