RU2043803C1 - Apparatus for bending and clamping tubes - Google Patents

Abstract

FIELD: metal pressure forming. SUBSTANCE: apparatus has a base with guides, in which a carriage is arranged; the carriage supports a holder with a tool and a bracket, joined with a mechanism for moving the carriage by a lever, axles and a fork. A holder with a second working tool is mounted on a shaft. The base is mounted with possibility of rotation relative to the shaft. The apparatus, provided by a rocker arm, joined with the lever with the aid of an axle, is spring-loaded in a direction, normal relative to a direction of motion of the carriage. The lever has an oval opening, in which the axle, connecting the lever and the rocker arm, is arranged. The working tool is changeable one. When the apparatus realizes function of a bending equipment, the working tool, secured to the carriage, is in the form of a bending roller, and the tool, mounted on the shaft, is in the form of a bending former. When the apparatus realizes a function of clamping equipment, its working tool is in the form of clamping members. EFFECT: enlarged using range of the apparatus. 3 cl, 3 dwg

Description

 The invention relates to devices for bending, and when replacing a bending roller and a template with grippers for clamping pipes, it can be used in pipe processing industries in various fields of mechanical engineering, in particular in power engineering, in the manufacture of coils for steam boilers.

 Known rotation unit with a pipe clamping mechanism of a pipe bending machine, comprising a housing with a mounted pipe rotation mechanism relative to its longitudinal axis and a pipe clamping mechanism.

 The pipe turning mechanism comprises a rotary faceplate mounted in a housing on bearings with a gear worm gear, meshed with worms mounted in bearings of the housing. Worms are kinematically connected by a pair of bevel gears.

 The pipe clamping mechanism comprises creepers mounted in the guide grooves with interchangeable clamping jaws, kinematically connected via articulated levers with a spring-loaded cylindrical slide, movably mounted inside the faceplate and rigidly connected to it by means of sliding keys. The slider by means of an annular guide made on its inner end surface is in contact with support rollers mounted rotatably on the axes in a cage connected to the rods of hydraulic cylinders pivotally mounted in the bearings of the housing. The pipe through the groove is loaded into the feed device.

 By activating the hydraulic cylinders to push out the rods of the cage, acting on the slider by means of rollers, makes it, overcoming the force of the springs, act on the articulated levers, which, moving the creepers in the guide grooves of the faceplate, clamp the pipe with jaws.

 The main disadvantages of the pipe clamping mechanism are the insufficient rigidity of the design of the clamping jaw drive assembly; the effect of pressure losses in the hydraulic system on the reliability of the clamp.

 Closest to the invention is a device for bending pipes, consisting of a drive carriage, movably mounted in the guides of the slide installed with the possibility of adjustment on the rotary support of the machine. In the guides, a clamping shoe is mounted, spring-loaded and pivotally connected by means of a lever and axles to the rod of the power hydraulic cylinder pivotally mounted on the bracket of the slide. A support roller in contact with the surface of the carriage is also fixed on the axis. Adjusting movements together with the carriage during adjustment are carried out by a screw, the vertical movement of the carriage is also limited by the screw. To limit the movement of the pressure shoe during the reverse stroke, an emphasis is used. The pipe before bending is fixed in the stream of the bending template of the pipe bending machine.

 By turning on the hydraulic cylinder, the support roller, moving along the surface of the carriage, acts by means of a lever through the axes on the pressure shoe, moves it and clamps the pipe.

 The main disadvantages of the clamping device for bending pipes are the inability to use it without significant structural improvements as a bending device when bending pipes by the rolling method; the impossibility of using uneven pipes and pipes with a wide tolerance field, which leads to a violation of a rigid straight reference line; the effect of pressure losses in the hydraulic system of the device on the reliability of the clamp; Significant amount of time spent clamping the pipe.

 The purpose of the invention is the creation of a simple universal device for bending, and when replacing the bending roller and the template with grippers for clamping pipes, providing increased labor productivity by increasing the speed of bending and improving the quality of bending by increasing operational reliability.

 This goal is achieved by the fact that in a device for bending and clamping pipes containing a base with a carriage moving in its guides, a bending roller and an arm connected to it by a lever, a beam, a fork with a mechanism for moving it, and a holder mounted on the shaft with fixed on it is a template, the lever is made with an oblong hole, and the beam is provided with a protrusion and is spring-loaded, creating a rigid horizontal straight support line.

 For the device to perform the clamping function, the bending roller and the template are replaced by grippers.

 The presence in the nodes of the lever systems of pipe bending devices of the lever with an oblong hole provides compensation gaps that smooth out pipe irregularities, while maintaining a rigid straight support line that does not respond to pressure drops in the hydraulic system, while increasing bending speed and reliability when clamping pipes.

 The rocker arm with a protrusion and springs, which securely fix it in a horizontal position, creates a rigid straight support line.

 In FIG. 1 shows the described device for bending and clamping pipes, the main view; in FIG. 2 section aa in figure 1; figure 3 the device is in working condition, a General view.

 A device for bending and clamping pipes contains a base 1 with a carriage 3 moving in its guides 2, a holder 4 mounted on it with an adjusting screw 5 and a bending roller 6. A bracket 7 is attached to the carriage 3, connected by axles 8 and bushings 9 with a lever 10, having an elongated hole 11, with a beam 12 having a protrusion 13. The beam is spring-loaded with springs 14. The bracket with a fork 15 is connected to the rod 16 of the power hydraulic cylinder 17, the box 18 is closed by a cover 19. The base 1 is mounted with a key 20 on a frame 21, mounted with the possibility of w rotation around a fixed shaft 22 fixed to it a pattern 23 and the pipe 24.

 The clamp is carried out by replacing the bending roller 6 and the template 23 with grippers 25.

 The described device for bending and clamping pipes works as follows.

 From the position shown in FIG. 1, by turning on the power hydraulic cylinder 17, the rod 16 with the plug 15 is driven to push, which, by means of the axes 8 and the bushings 9, rotate the lever 10 having an elongated hole 11, and the rocker 12 having a protrusion 13, spring loaded with springs 14 in a vertical plane, to the position shown in FIG. 3, moving the bracket 7 with the carriage 3, the holder 4 fixed thereto with the adjusting screw 5, the bending roller 6 in the guides 2 to the right until it contacts the pipe 24.

 Next, the base 1, fixed by means of a key 20 on the frame 21, rotates around a fixed shaft 22 with a template 23 fixed on it, starting to bend the pipe 24. In this case, the protrusion 13 abuts against the base 1 and fixes the beam 12, spring-loaded with springs 14 in a horizontal position, and the elongated hole 11 occupies a middle position, forming two compensation gaps, and if there are irregularities in the pipe 24, for example, the gap is selected on the larger side from above and the gap from below on the lower side.

 After bending, by turning on the power hydraulic cylinder 17, the rod 16 with the plug 15 is moved into retraction, which, through the axes 8 and the bushings 9, rotate the lever 10 and the rocker 12 in the vertical plane to the initial position by moving the bracket 7 with the carriage 3 mounted on it by the holder 4 with an adjusting screw 5, a bending roller 6 in the guides 2 of the base 1 to the left, freeing the bent pipe 24.

 The pipe is clamped in the same sequence when replacing the bending roller 6 and the template 23 with grippers 25.

 The proposed technical solution due to the new design and layout approach allows to increase labor productivity by 15-20% by increasing the bending speed, and the reliability indicator by 30%. In addition, the device for bending and clamping pipes is compact and can be used in various types of bending cars.

Claims (3)

 1. DEVICE FOR BENDING AND CLIPPING PIPES, comprising a carriage mounted on the base with the possibility of reciprocating movement along the guides with a holder fixed to it with a working tool and an arm connected by a lever, axles and fork with a carriage moving mechanism, and also mounted on a shaft a holder with a second working tool, the base being mounted rotatably relative to said shaft, characterized in that it is provided with a lever connected to the lever via the axis of the shaft scrap, spring-loaded in a direction perpendicular to the traveling direction of the carriage, and a lever formed an oval hole, which accommodates the axis connecting the arm with a yoke formed with a protrusion cooperating with a base, wherein the working tool is made exchangeable.  2. The device according to claim 1, characterized in that the working tool placed on the carriage is made in the form of a bending roller, and the tool placed on the shaft in the form of a bending template.  3. The device according to claim 1, characterized in that the working tools are made in the form of grips.

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