SU1038111A1 - Apparatus for dismounting expanded tubes - Google Patents

Abstract

1. DEVICE FOR DISMANTLING THE DISCONNECTED PIPES, containing an expanding collet with petals, a core mounted inside the collet, cutters and an axial movement drive thereof, as well as elements for fixing the device on the pipe, characterized in that, to simplify the design and improve the quality of dismantling at the same time increasing the productivity, the collet is fixed on the drive housing, the device fixing device on the pipe is made in the form of outer shoulders on the ends of the collet lobes, the ree P1 are fixed on the connector and are located m forward petals collet, and the core is coupled to drive axial movement. 2. The device according to claim 1, characterized in that the collet in the middle part is made conical and provided on the guide ring with grooves for the passage of the incisors. 3. The device according to claims 1 and 2, characterized in that the cutter is made in the form of a plate with two parallel rows of teeth on one of the sides. 4. Device on PP. 1-3, characterized in that the cutter is made (LS n in the form of plates with two pairs of parallel rows of teeth on the sides. 5. The device according to claims 1 and 2, shows that the cutter is made in the form of a prismatic plate fixed on the core in doqtail type naqy. l 00

Description

The invention relates to repair work, in particular, to devices for dismounting flared tubes in boiler or tenloobmenochnyh devices ,. A device is known for dismantling flared tubular boilers, containing a ruieBMaTHHscKHft hammer and two elongated igangas interacting with it, the outer surfaces of which are formed by longitudinal wedge flat edges and cylindrical surfaces adjacent across the entire surface to a part of the inner surface of the pipe into which they are inserted. besides, a stop is protruding above the cylindrical surface at one of the rods. The limiter and the cylindrical part of this rod, in turn,. have a longitudinal guide groove. with a T-shaped section in which the cutter is located to receive two longitudinal parallel spaced slots in the pipe, and on the second rod there is a protrusion with a hole into which the handle handles with a cam are inserted to remove the second device rod from the pipe after the cutting operation is completed the account of the cam stop in a hard material insert inserted between the outer surface of the board and the cam l}. The disadvantage of this device is the presence of a large number of parts of the slanty configuration, which determines the amount of mechanical work on their manufacture, as well as operations on demotooting flared tubes,. It is also known a device for demounting flared tubes, comprising a spindle with a three-way tape thread, at the end of which a screwdriver with a three-cutter collet is screwed in to obtain longitudinal parallel grooves in the tube, made as one piece with a collet, a bearing sleeve and a nut with handles to mix the collet in the pipe in the axial direction, while inside the hole of the collet and A shade A there passes a stripper, which on one side ends with a conical head to unclench the collet, and on the other - a thread on which imena ratea, for a fixed locking screw in the ke spindle to prevent it from p & moving in the axial direction. The device is also equipped with elements that, in the form of fingers C2 J, are axing its position in the pipe. However, this device is also characterized by the complexity of the design, and, additionally, the forces arising during the dismantling of the pipes during the cutting process are transferred to the locking pins, which, resting on the tube plate, can deform it especially when cutting the incisors to the depth of cut in one pass. When cutting the cutters to a depth of cut in several passes, the laboriousness of dismantling the pipes increases. The purpose of the invention is to simplify the design of the device and improve the quality. WA dismantling pipes at. simultaneous performance improvement. The delivered chain is achieved by the fact that in a device for dismounting flared tubes containing an expandable collet with lobes, a core mounted inside the collet, cutters and their axial movement, as well as retaining elements for holding the device on the pipe, the collet is fixed to the drive housing; made in the form of outer shoulders on the ends, petals of danga, incisors fixed on the core and located between the petals of the collet, and the core is connected with the axial movement guide. The collet in the middle part can be made conical and provided with a Shim ring with grooves for the passage of the incisors. The cutter may be made in the form of a plate with two parallel rows of teeth on one of the sides for obtaining two longitudinal parallel slits. The cutter can be made in a vvde plate with two pairs of parallel rows of teeth on the sides to obtain two pairs of longitudinal parallel slots opposite to each other. In addition, the cutter can be in the form of a prismatic plate fixed to the core like a dovetail tail . Fig, 1 shows the device in the initial position, a general view; in fig. 2 - the same in the working position; Fig. 3 is a section A-A in Fig. Ij in Fig.; 4 is a section B-B in Fig. 2j in Fig. 5, the same, an embodiment for producing two pairs of longitudinal parallel slots in the pipe, which are located against each other. ; Fig. 6 is the same, an embodiment with cutters in the form of prismatic plates fixed on the core in slots of the last type tail; Figure 7 is the same, a variant with cutters made in one piece with the core.

The device comprises a clamping collet 2 fixed on the housing 1 with locking elements 3, made on the ends of the petals of the collet from the outer side in the form of shoulders. Inside the collet is placed a cylindrical core 4 with cutters 5 fixed in it,

located between the petals of the collet. The core 4 is connected with the rod 6 y) and the water supply 7 axial displacements. The middle part of the collet 2 is tapered, and on the larger diameter side inside the collet, a guide pin 8 is mounted with grooves for the cutters to prevent angular rotation of the core 4. The cutter 5 can be inserted as a plate 9 with two parallel rows of 1O teeth on one from the sides to obtain two longitudinal parallel slits in the pipe 11.

The cutter 5 can also be made in the form of a plate 9 with two pairs. parallel rows of 1O and 12 teeth on the sides for obtaining two pairs of parallel inserts v in the pipe 11, located progivopo-. falsely to each other.

The cutter 5 can be made in the form of prismatic plates 13, fixed on the core 4 in grooves of the dovetail type,

In addition, the cutter 5 can be made in one piece with the core 4 with rows of 14 teeth by the number of handles on the collet.

The device works as follows.

In the initial position, i.e. in the compressed state, the elastic end of the collet 2 is inserted into the hole of the remainder of the pipe to be removed 11, the width of the heat exchanger tube board. Then turn on the drive 7,

for example, a double-acting power cylinder. The movement of the piston of the actuator 7 through Shgbk 6 is transmitted to the cylindrical core 4, in which the reecs 5 are fixed. The middle part and the free end of the core 4 with a diameter smaller than the inner diameter of the pipe 11 to the two wall thicknesses of the collet 2, the entrance to the free end of the collet, with This is her petals, apart, tightly fit to the inner wall of the pipe. With further advances of the core 4 at the moment of contact of the cutters 5 with the pipe under the action of cutting forces of the entire collet 2 with the drive housing 1, the opposite direction of the locking elements 3 stops at the end of the pipe 11 and the entire device is fixed in the pipe, and the cutters 5 cut parallel slots in the pipe 11 .

During the reverse movement, the rod 6 of the core drive 4 with the cutters 5 returns to its original position, thus releasing the elastic part: the collet 2 from fixing in the pipe 11, and the entire device freely comes out of the pipe. The weakened-longitudinal section of the pipe stem between the slits can be bent inward. As a result, it forms with an elongated slit, h-hо, by means of appropriately applied transverse forces, compress the passage through the board through the board and easily. remove it from the hole in the board.

A grooved guide ring 8 protects the core 4c with cutters b from an accidental turn around the axis.

The collet in the middle part of the cone increases its elasticity. In the case of selective removal of pipes from the heat exchanger with known internal pipe cutters, the section of the defective pipe between the tube plates is cut off, and the pipe sections in the tube plate are released from the holes with the proposed device.

The use of the invention provides a simplified design of the device and improves the quality of the dismantling of pipes with a simultaneous increase in productivity.

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Claims (5)

1. DEVICE FOR Dismantling Flared Pipes, containing an expandable collet with petals, a core installed inside the collet, cutters and an axial displacement drive, as well as elements for fixing the device to the pipe, characterized in that, in order to simplify the design and improve the quality of dismantling while increase productivity, the collet is fixed to the drive housing, the fixing elements of the device on the pipe are made in the form of external collars at the ends of the petals of the collet, rae; The cores are fixed 'on the core and are located between the petals of the collet, and the core is connected to the axial displacement drive. 2. The device according to π. 1, characterized in that the collet in the middle part is tapered and provided * on a guide ring with grooves for the passage of the cutters. 3. The device according to paragraphs. 1 and 2, characterized in that the cutter is made in the form of a plate with two parallel rows of teeth on one of the sides. 4. The device according to paragraphs. 1-3, characterized in that the cutter is made in the form of plates with two pairs of parallel rows of teeth on the sides. 5. The device according to paragraphs. 1 and 2, which is consistent with the fact that the cutter is made in the form of a prismatic dam fixed on the core in a dovetail-type groove. 1 1038111 2