SU914289A1 - Automatic machine for cutting continuously made polymeric tube - Google Patents

Description

The invention relates to the machining of plastics, in particular to cutting tubes of elastic polymeric material, intended for the manufacture of blood service systems and various surgical equipment.

The manufacture of tubes with a diameter of 5.5 mm with a wall thickness of 1 mm and a length of 19 to 130 cm has a number of difficulties. Production must be waste-free, in order to save expensive material. It is necessary to mechanize and automate the entire process in order to eliminate manual operations that increase the insemination of the products by microbes and reduce the reliability of their subsequent sterilization. It is necessary to reduce the production line in length to reduce production space.

A device for cutting plastic endless cord containing the input node processed

2

material containing guide rollers, fixed knife 'with a hole for material to pass through it, movable knife, guides, end contact sensor,

⁵ associated with the drive, and Faro. The cut cord is passed between the rotating rollers and through the hole in the fixed knife is fed into the guides. · After the cord

® touches the sensor, the drive drives the knife and simultaneously retracts the slide guide. A piece of cord falls into the container below. In this case, the method ¹⁵ protalki Bani processed material before the stop of the contact probe [11.

However, on a known device

You can cut cords and tubes that

„They will not bend much, to proc>

Essentially, they will not be able to be driven into the guides before contact with the sensor. These can be rigid tubes of sufficiently large diameter or with

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rather large wall thickness, i.e. The proposed device can not be used for cutting tubes of elastic polymer material. five

The closest to the present invention is a device for cutting a continuously manufactured polymer tube, which contains a billet input unit mounted on a frame, a cutting node placed behind it, made in the form of a rotary knife, kinematically associated with it, a sampling unit and a measuring unit,

In this device, the workpiece is fed by the input unit to the cutting unit, in which the workpiece is cut. Cut off the workpiece is fed into the table cell - a selection node. Measure 20 of the required length of the workpiece is produced by the measuring unit consisting of a disk, for one revolution of which the workpiece is moved to a given length [2]. . 25

The disadvantage of this machine is that it does not provide for the orderly packing of the tubes. At the exit from the cutting unit, the tube begins to hang down almost vertically and falls in an orderly manner into the container being replaced. Elastic tubes made from polymeric materials (for example, polyvinyl chloride, T-35), suitable for blood transfusion systems, even after exiting ₃₅ from the cooling bath of an extrusion machine for some time (15-30 min ·) have the ability to stick together with each other. With regular packing, this does not affect their piece separation from each other during further production.

In the absence of ordered stacking, it is sometimes impossible to disassemble stuck tubes, and the whole batch has to be thrown away.

The purpose of the invention is to avoid creasing the tube during installation.

This goal is achieved by _{5 (}} that in a cutting machine for a continuously manufactured polymer tube containing a billet input unit mounted on a frame, a cutting unit located behind it, made in the form of a rotary knife, kinematically associated with it a selection node and a measuring unit According to the invention, the selection assembly is made in the form of a conveyor with a tube with holes installed one side of it, communicating with the compressed air supply system, and the conveyor is located symmetrically on the other side of the conveyor. razhatelya L-shaped profile.

Moreover, the measuring unit is made in the form of a spring-loaded roller connected through a sensor and a compressed air supply system with a rotary knife drive and a selection unit.

FIG. 1 shows the scheme of the proposed device; in fig. 2 device of a rotary knife; on fig.Z selection device.

The cutting machine for an elastic polymer tube has a carrier frame 1 mounted on support 2. On frame 1 a belt conveyor 3 is placed, driven by an electric motor 4. At the entrance of the conveyor there is an input unit consisting of a guide 5 and a pressure roller 6. Behind the input unit there is a cutting unit consisting of a ⁺ fixed knife 7 with a hole 8, made in the form of a metal wall. On the fixed knife 7 there is an axis on which the movable knife 9 and the ratchet 10 rigidly connected with it are planted, the number of cutting edges of the knife being equal to the number of teeth of the ratchet. The ratchet has an engagement with the lever 11 of the pneumatic actuator 12. Further, in the direction of the conveyor 3, there is a measuring unit. It is mounted for movement along the conveyor on the carrier frame 1 and has a setting roller, 13 connected by a lever 14 with a pneumatic sensor 15 pneumatically connected to a pneumatic actuator 12. At the output end of the conveyor 3 there is a sampling assembly consisting of a tube 16 with holes 17, communicating with the compressed air supply system - with the pneumatic actuator 12 and the reflector 3 of the L-shaped reflector 18 located symmetrically on the other side of the conveyor 3, which is a metal or plastic rail.

The machine works as follows.

When the motor is on, the elastic polymer tube 19 is fed from the cooling system of the extrusion machine, which produces polymer tubes from a polymer granule. A guide 5

5 9

machine and falls directly under the pressure roller 6. After that, the tube 19 begins to continuously move along the belt conveyor 3 with the speed of its exit from the extrusion machine, and the speed of the belt conveyor 3 must necessarily exceed the speed of the tube 19 from the extrusion machine, otherwise thin-walled elastic tube will bend and descend from the conveyor. At a higher speed of the conveyor 3, the tube moves with slippage and is always tensioned.

From the guide 5, the tube enters the hole 8 of the stationary knife 7, passes between the cutting edges of the movable knife 9 and then falls under the setting roller 13. In this case, the roller 13, rolling on the tube, rises and opens with its lever 14 an outlet of the air sensor 15 associated with the drive 12.

Since the sensor 15 is under pressure of compressed air, the latter is able to act on the pneumatic actuator 12, which actuates the lever 11 and through the ratchet 10 the movable knife 9- The knife 9 cuts off the part of the tube between the knife 8 and the roller 13- This part of the tube, being cut off from the rest of the tube, gets the opportunity to move at the speed of the conveyor. This means that a gap begins to form between this segment and the rest of the tube. The tube section passes under the roller 13, which then drops and thus stops the air supply to the actuator 12, which causes air to drop from the actuator 12 to the tube 16, against which the cut-off, cutting pipe, and simultaneous return of lever 11 to one ratchet tooth 10, i.e. in its original position.

Air, getting into the tube 16 and leaving the holes 17, evenly spaced along the entire length of the tube 16, 50

drops the cut off part of the polymer tube to the reflector 18 and further respectively oriented - into the container under it. At this time, the next part of the polymer tube 55, which must be cut off, fits to the roller 13,

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gets under the roller 13, raises it and the whole described cycle repeats. The length of the finished tube is adjusted by moving the roller 13 along the frame 1,

5 as indicated by the arrow.

The advantage of the proposed device is a uniform, orderly laying of polymer tubes, protecting them from crushing.

An orderly stacking will allow you to use a system of cells located radially on a carousel device as a container, which will automatically rotate one 15th step to place the tubes in the next cell after filling the previous one. This arrangement will allow the machine to be used to cut tubes with a subsequent processing line and create the preconditions for the complete automation of the entire production process.

Claims (2)

Claim one'. A cutting machine for a continuously manufactured polymer tube containing a billet insertion unit mounted on a frame, a cutting unit arranged behind it, made in the form of a rotary knife, a kinematically associated selection unit and a measuring unit, characterized in that, in order to prevent the tube from being crushed , the selection assembly is made in the form of a conveyor with a tube installed on one side of it with holes communicating with the compressed air supply system and located on the other side of the conveyor about razhatelya L-shaped profile. 2. An automaton according to claim. ^ Characterized in that the measuring unit is made in the form of a spring-loaded roller connected through a sensor and a compressed air supply system with a rotary knife drive and a selection unit.