DE2038151B2 - Device for punching plastic drainage pipes - Google Patents

Description

30th

The invention relates to a device for perforating drainage pipes made of plastic with at least one by means of a drive against the wall of the pipe to be punched and back to the starting position displaceable piercing pin, whereby the tube can also be moved in the axial direction during piercing and the piercing end of the piercing pin during the piercing in the direction of movement of the pipe can be carried.

It is a device for making holes in plastic existing drainage pipes known (SU-PS 1 93 045).

This known device includes an implement which is mounted on a shaft of an electric motor Forms milling device designed in the form of a disk. This milling disc is driven by a cam gear in a pendulum movement offset, in which the disc to cut out in the wall of the perforated pipe to be arranged longitudinal slots this approached and then back to the starting position is returned.

However, such a known device has the disadvantage that this arranged in the pipe Slots have the shape of elongated holes, so that the pipe perforated in this way only has a low strength and has poor performance. Such a known device is also structurally known Complicated design.

A device for punching pipes made of plastic is also known (FR-PS 15 78 566), in which one during the punching process rotating sleeve with punching pins guided on cams stopped for a short period of time must be when the tube is advanced so that the punch pins or the hole made not damaged.

However, such a known device has the disadvantage that this by necessity performing the gradual stopping of the entire device in an uneconomical manner has producible complicated structural design

A device for punching drainage pipes made of clay has also become known (US-PS 25 82 645), in which the pipe is advanced continuously. This device has a piercing pin, which is moved with the pipe during the piercing. The punch pin is closed for this purpose articulated and is brought into the starting position by a spring after punching.

However, the known device has the disadvantage that the entire arrangement by the need the lateral cushioning is structurally extremely complicated

The invention is based on the object of a device for punching holes made of plastic To create drainage pipes that should be structurally simple and uncomplicated.

The object is achieved in that the dimensions of the piercing pin in terms of its length and its cross-section and its material are chosen so that the through its the entrainment path through the to be punched tube during the punching corresponding deflectability caused stresses within of the elastic range.

It is advantageous here if the ratio of the length to the diameter in the case of a round punching pin of the punch is between 30: 1 and 50: 1.

According to the invention there is the advantageous mode of operation that the device in continuous Work flow without the need for gradual stopping of high strength punched workpieces capable of producing, the entire device being an uncomplicated one that can be produced in an economical manner and has a simple structural design.

In the drawing, an embodiment of the subject matter of the invention is shown. It shows

F i g. 1 the device for punching existing plastic drainage pipes in the axial Longitudinal section,

F i g. 2 the working tool on a larger scale in longitudinal section,

F i g. 3 shows a section along the line U-II according to FIG. 1.

The device for punching existing plastic drainage pipes has a single or more than perforated pins 1 (Fig. 1) designed Working tools, the working end of which faces the pipe 2 to be punched.

leather piercing pin 1 is fixed in a slider 3 (F i g. 1 and 2), which extends in a radial direction Groove of the stationary on a support 5 (Fig. 1) arranged housing 4 is arranged. On one cylindrical projection of the slider 3, a roller 6 is mounted, which in a face jaw 8 arranged profile groove 7 engages. The centering of the front jaw 8 with the stationary housing 5 (Fig. 1) takes place by means of a socket 9, through the central opening of which the pipe to be perforated is passed. In the walls of the socket 9 are the respective perforation pin 1 arranged opposite openings intended for the perforation pin 1 to pass through.

The front jaw 8 is connected to a shaft 13 via pulleys 11 and 12 of a V-belt drive device as well as via gears 14 and 15 from an electric

gate 10 driven. The gear 15 is rigid on the Front jaw 8 attached

The device for moving the pipe 2 to be perforated in the longitudinal direction consists of two driver rollers 16. The drive device of which can be kinematically connected to the electric motor 10. Will the device in a plant for the production of drainage pipes used, so can be used as a device for moving the pipe to be punched in In the longitudinal direction, the per se known driver devices of the system are used.

The perforation pin 1 is made of spring wire in such a way that that with a round piercing pin the ratio of the length to the diameter of the piercing pin I between 30: 1 and 50: 1. When punching glaucoma Pipes will shape the working end of the piercing pin 1 in a cylindrical shape *; when punching of corrugated tubes, the working end of the punch pin, as in FIG. 2 shown, rounded.

The mode of operation of the device for punching plastic drainage pipes is as follows: The The pipe 2 to be perforated (FIG. 1) is pushed through the central opening by means of the driver rollers 16 in the longitudinal direction the socket 9 moved therethrough. The front jaw 8 is driven by the electric motor 10 via pulleys 11 and 12 of a V-belt drive device via the Shaft 13 and the gears 14 and 15 are driven.

Due to the cam-like interaction of the Profiinut 7 (FIG. 3) with the roller 6 that engages in it the slider 3 is moved back and forth in the radially extending groove of the housing 4. Sew here the punch pin 1 periodically moves to the tube 2 to be punched, punches through it -. in hole and is then in returned to the starting position

During the period in which the piercing pin I with the longitudinally shifting to piercing tube 2 is in contact, the piercing pin 1 as a result of the entrainment movement of the tube deformed as a result of the dimensions chosen and the material of the same only in the elasticity range and by a value that corresponds to the way which the tube 2 passes through during its entrainment contact with the perforation pin 1, corresponds thereby the execution of round holes in the walls of the pipe to be punched is guaranteed.

When punching corrugated drainage pipes, it is useful to use the working end of the punch pin 1 to round off, which leads to inaccuracies in the distances between the shafts forming the pipe wall and speed errors the longitudinal displacement of the pipe as well as the rotational speed error of the front jaw 8 to be balanced. Such errors to be compensated arise if the perforation pin hits slides on a wave crest into the depression forming the wave trough between two waves.

The device has an extremely simple, uncomplicated structural design and requires operation no specially trained specialists as operating personnel.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Device for perforating drainage pipes made of plastic with at least one piercing pin that can be displaced by means of a drive against the wall of the pipe to be perforated and back into the starting position, the pipe being movable in the axial direction even during the piercing and the piercing end of the piercing pin selecting jo rend of the hole can be carried along in the direction of movement of the pipe, characterized in that the dimensions of the piercing pin with regard to its length and cross-section and its material are chosen so that the deflectability during the piercing process corresponds to the entrainment path through the pipe to be pierced caused stresses lie within the elastic range. 2. Device according to claim 1, characterized in that the ratio for round perforated pins the length to the diameter of the piercing pin is between 30: 1 and 50: 1.