SU923865A1 - Apparatus for producing heat shrinkable tubes - Google Patents

Description

The invention relates to devices for the manufacture of heat-shrinkable tubes of insulating material and can be used in electrical engineering.

A device is known for the continuous molding of the surface of articles, for example pipes, comprising half-molds fixed on a traction chain, copiers and a guide [1].

The disadvantage of this device is that it cannot be used to increase the diameter of the tubes at a fixed length.

The closest to the proposed is a device that contains two endless conveyors placed one above the other, half-molds, one of which is fixed on the first conveyor and the other on the second, locking elements and copy plates (£ 2).

A disadvantage of the known device is the impossibility of increasing

2

the diameter of the tubes with a fixed length, which reduces the quality of the products, since the shrinkage of the pipe does not provide the specified dimensions along the length.

The purpose of the invention is to improve the quality of products by preventing the extrusion of tubes in the axial direction.

This goal is achieved by the fact that in the device, consisting of two endless conveyors placed one above the other, half-molds, one of which is fixed on the first conveyor and the other on the second, locking elements and copy plates, the locking elements are made in the form of the possibility of radial movement of the clamps with adjusting screws that interact with copy plates at the entrance to the gap between the conveyors.

FIG. 1 shows the proposed

device, general view; in fig. 2 of 923865 4

Section A-A in FIG. one; in fig. 3 half mold with open clip.

The device contains a feed drum 1, a heater 2, two endless 5 conveyors arranged one above the other with half-molds 3 and 4 fixed to them, a receiving drum 5. The half-shapes are interconnected, each having a cavity 6 in the form of a half-cylinder with a smooth working surface 10 7. In the movement section, # from the half-form 3 and the half-form 4 form a 'hollow form. The clamps 9 are connected to the proforma with screws 8. The clamps 9 have longitudinal notches 10, which allow them to move relative to the semi-plate in the radial direction. For precise adjustment of the amount of movement, the clamps have adjustment screws 11. To reduce heat transfer from the tube to the clamps, the latter on the front part are thermally insulated 12.

To actuate the clamps while clamping the tube and holding them in this position, copy plates 13 are installed in the movement section 25 with a profile surface along which the adjusting screws 11 of the clamps 9 move.

To connect the half-molds 3 and 4 with the bush-roller chains 14 of the conveyors, intermediate forked links 15 are installed, which are also the outer connecting plates of the chains. Half-frames are attached ₃₅ to intermediate links using screws 16 with countersunk heads.

For fixing the tube in a blown-up condition, a cooling system is provided, consisting of channels 17 and connecting hoses (not shown). Channels 17 and plates 18 connecting them are! simultaneously guides when moving conveyors.

Adjusting the tension of the chains 14 of the con _<3 weir and the combination of the half-form 3 and 4 at the input is carried out by changing the position of the driven sprockets 19 ·

Leading sprockets 20 are provided for driving the conveyors and associated half-molds.

The receiving drum 5 is used for winding a swollen and fixed tube.

The device works as follows.

To start the device, it is necessary to pass the end of the tube 21 heated in heater 2 through the cavity formed by half-molds 3 and 4 in section 6c. For this, the tube 21 is inserted between the half-molds and includes a drive (not shown). The closest pair of clips 9 captures the tube and transports throughout the area of the database. By the time this pair of clamps passes through section 63, the occled pair of clamps 9 picks up and transports the tube, etc. before the appearance of the tube 21 at point s. As soon as the end of the tube appears at point c, it is connected with a hose with a fitting of the receiving drum 5 and turn on the supply of compressed gas. When this occurs, the blowing and cooling (fixing) of the tube 21 in the area from point c to the clamps 9, which are in the closed state in section 63, occurs.

The opening of the clamps 9 after they pass section 63 (the end of the copier plates 13), occurs under the action of compressed gas in the inflated tube 21.

The movement of the tube after the start of the inflation is carried out by friction against the inner surface 7 of the half-form 3 and 4, and the clamps 9 in this case perform only the role of a locking device.

The synchronism of the movement of both rows of half-molds is carried out by a pair of gear wheels that are engaged (not shown). Swollen and fixed the tube 21 is wound on the receiving drum 5.

The proposed device due to the implementation of the locking elements in the form installed on the half-form with the possibility of radial movement of the clamps with the adjusting screws eliminates the pull tubes in the axial direction, improves the quality of the Products.

Claims (1)

Claim A device for the manufacture of heat-shrinkable tubes containing two endless conveyors placed one above the other, half-molds, one of which is fixed on the first conveyor and the other on the second, shut-off elements and copy plates, characterized in that prevent pull tru923865 sideways in the axial direction, the locking elements are made in the form of clamps installed on the half-molds with the possibility of radial movement of the clamps with adjusting screws interacting with the copier plates at the entrance to the gap between the conveyors.