MXPA97000628A - Support arm assembly for pipe machines with automatic placement dela tube - Google Patents

Abstract

The present invention relates to a support arm enamel for a pipe bending machine with a support arm, a mandrel for positioning a slide pipe on the support arm, and a pipe fastener, comprising: one or more flanges linear arranged along the support arm, the mandrel includes a piece to intercept the flanges through a ratchet between a high rest position and a lowered work position by moving a buttonhole, in which the ratchet can slide and which has raised edges against which the pawl is loaded under the action of a piston, and an individual hydraulic actuator or actuator, which simultaneously operates the pipe holder and the ratchet commutator

Description

ASSEMBLY OF SUPPORTING ARM FOR PIPING MACHINES WITH AUTOMATIC PLACEMENT OF THE PIPE DESCRIPTION OF THE INVENTION The present invention relates to a support arm assembly for pipe bending machines. As is known, the support arms for pipe bending machines are those assemblies, which are going to be associated with a pipe bending machine, so the basic functions to be performed are the support and placement of a pipe in the progress of a bending operation. The positioning function is performed by a mandrel that slides, in the form of a location on the same arm. In the pipe bending machines currently in use, the operator has to move away from the command area to go to the mandrel of the support arm to open and close it. Placement beads are to be inserted and manually disinserted with an arrow with adjustable rims through handles placed in the command area. A manual operation, not automatic, has to do with this. Nowadays, sophisticated numerical control machines are on the market and are available to automatically perform the aforementioned function, but with expensive electronic and mechanical systems, for example, by means of hydraulic, electromagnetic and electronic servo control boxes. The object of the present invention is to provide a pipe bending machine that allows the positioning function to be performed automatically, but at the same time to be of a non-costly constitution. Therefore, the present invention relates to a support arm assembly for a pipe bending machine, with a pipe laying mandrel slidable thereon, provided with a pipe holder fastener, including one or more linear flanges. arranged along the arm; the mandrel including a piece for intercepting the ridges through a ratchet connected between a raised rest position and a downward working position by the displacement of a buttonhole; where it can slide, having raised edges where it is loaded against the same ratchet, under the action of a piston; actuating, the step of opening / closing, simultaneously by means of hydraulic or air impulsion, of the holder of the pipe carrier and the connected of the ratchet. Further, the present invention relates to a support arm assembly for a pipe bending machine, wherein the mandrel further comprises reversible angular flange pins with a steering cut, provided on the periphery of the same mandrel, cooperating with a contrast spring-loaded, the contrast being able to be inserted / disinserted for right or left curves through a site with a cutting tip driven by a lever mechanism controlled by flange contrasts arranged on a linear guide. The present invention will be better understood on the basis of the following detailed description of a preferred embodiment thereof, given only as an example part, absolutely without restriction, with reference to the accompanying drawings in which: FIGURE 1 is a longitudinal sectional view of the arrow-core mandrel of the assembly, in a closed state; FIGURE 2 is a view illustrating a ratchet piece used for linear positioning of the mandrel in cooperation with ridges provided on the arm of the assembly; - FIGURE 3 is a view illustrating the angular lips of the mandrel, and - FIGURE 4 is a top view of the core arm assembly of the present invention with the mandrel mounted.

The assembly that is the subject of the present invention, therefore, includes a support arm, which is to be mounted with an end next to a pipe bending machine and an arrow-core core mandrel, slidably mounted on arm. As you can see in FIGURE 1, the core arrow-core mandril M comprises a sleeve sleeve 1 supporting the working elements of the mandrel. Basically, the working portion is an air cylinder comprising a cylinder 2 that develops on two sections, one with a smaller diameter, housed and supported on the jacket 1, and the other with a larger diameter, which enlarges itself same in correspondence with an end section of the same support, otherwise also being enlarged as a flange. In the cylinder, the relevant piston 3 is mounted, inside which the core arrow slides on the assembly. The larger diameter portion of the cylinder defines a chamber 4, wherein the head 3 'slides and operates the piston 3, while the piston rod is supported by the smaller diameter section of the cylinder. The air for actuating the piston is allowed to enter through a manifold (not shown) into a small hole 5 in direct air communication with the chamber between the rear portion of the piston head and its flange section against the body of the piston. cylinder. To the rear, the head has a stepped front geometry that opens a chamber (chamber 6) in its stop state against the cylinder, in the fully backward movement position. The cylinder, on its side, also has a stepped back geometry, which opens a corresponding chamber 7. The stop between the cylinder and the piston head, therefore, takes place in correspondence with two extreme steps. In chamber 7, a gasket is arranged for the piston rod. In the smaller radius section of the cylinder, otherwise, a totally circumferential depression 8 is made, which is to be filled with grease, in order to develop a lubricated air space for a good sliding of the rod. In the front passage of the head 31, a gasket 9 is provided for the sliding of the piston head in the larger diameter section of the cylinder. Between the support sleeve 1 and the cylinder 2, there are provided two toroidal seal rings, or O-rings, 17, 17 ', which aim for the air to flow out of the mandrel. The piston head has an enlarged geometry on the front part, presenting a depression for supporting a helical compression spring 10 on one side, at the other end touching a support ring 11, also slidable, like the piston head, in the cylinder 2. A ring 12 mounted on the cylinder 2, near the extreme ejection, prevents said spring stop ring from jumping out of the mandrel body made of the support and the same air cylinder. The larger diameter section of the cylinder 2 has two continuous projections 13, 14, which extend over the entire restrictive cross section of the same cylinder (circular development). The stop 13 is a front stop and the stop 14 is a rear stop. Beyond the projections 13, the cylinder projects with a visible suspension. On this suspension, a notched ring notch 15 is fitted, with a first cylinder tract, with which, first, in fact, it is adjusted and then continues as a suspension, and a second tract of taper 15 'narrower. In the knotted ring notch, a pipe holder holder 16 is mounted with four (4) interchangeable clamps, for example, in Teflon or bronze. The anterior piston 3 continues, beyond the head 3 ', inside the spring 10, upwards, towards a substantial projection from the cylinder liner which supports it, into the ring groove 15, then passing inside the ring 11. At its free end it supports the clamps 16, actuating its opening / closing on the core arrow.

The described construction represents an individual drive cylinder. With its actuation, the slide is displaceable forming the continuation of the rod and the fastener is closed. At the end of the air pressure (pressure release), the compression ring returns to the piston to a rest position (open clamp). Everything is controlled through a board with a GRIPPER CLOSE button, through which an electrovalve is operated that performs the function of supply / release of pressure for the air cylinder. The other circular flange 14, otherwise, delimits, together with the end section of the support jacket 1, with which one looks at, a space, in which a rotatable ring groove 18 is arranged, which aims at the angular positioning of the mandrel, lightly rubbed through a toroidal ring. On the ring notch, a graduation system of 18 to 360 ° is printed; Referring to FIGURE 3, the cylinder 2, in the two continuous protrusions 13 and 14, has a continuous groove, by means of which the locatable pins 200 are made adjustable to the angular flanges cooperating with a spring-loaded locator 201, integral with the same mandril. The pins have their head cut directionally, and are reversible, towards the direction of the curve that is going to be printed on the pipe. For the right and left rotation curves, the pins with the cutting portion are placed in such a way that they can perform the rotation. The locator 201 is arranged horizontally, by means of one side of the same mandrel, whereby it is integrally mounted, as mentioned above, through a support 201 ', and is loaded by means of a helical compression spring 201" , housed inside the support 201 ', towards a lowered position, where the same locator engages with the heads of the pins 200, stopping the rotation of the mandrel, when it finds the portion without cutting. towards the bottom, vertically, then perpendicularly towards the locator 201, supporting a small cylinder 202 with a cutting suspension end 202 ', which in its cutting position receives the handle 201"' of the locator 201, but which the push away from the uncut portion. In this way, it acts as a command for the connection of the same location 201 between the lowered / raised positions. The small cylinder is driven with the following construction. Lower is threaded through a bushing 203, in which it is connected through a pin 203 '. Such a bushing is located near a lever 203", rotating horizontally, which, with its other end, can be coupled with linear stop lamellae having a suspension head 204 and a fixing body 206 on a guide 205.

To operate the mechanism, it is sufficient to move the mandrel on the guide 205, displacing its carrier; the lever 203"finds the head 204 and thus rotates, rotatingly dragging the small cylinder 202 as well, and in this way the cutting mill displaces the handle 201" ', thus raising the locator beyond the spring charging the latter. The mandrel in this way is free to rotate. The clamps 16 are provided with through pins 20, 20 ', which can be adjusted by screwing to be able to operate in irregular section pieces. The mandrel is mounted on a support and guide arm, not shown, which is associated by one side of the pipe bender with which it has to cooperate. In addition, the arm lamellae 19 are arranged in such a way that they fix the linear flanges defining many working positions. The interception of these guide positions is affected through a ratchet interception piece 100 mounted on the mandrel described above, thus made, as can be seen in FIGURE 2. The interception piece 100 includes a support 1 'that comes out of the support sleeve 1 of the mandrel above it. In the same baboon, a second air cylinder 1"is housed, driven by the same air source of the mandrel cylinder, it includes a rod 101 loaded towards a rest position backwards, by means of a compression spring 102 housed in the cylinder, which rests on its two ends, respectively, on an enlarged head, of the cylinder and on a section of extreme close circular closing of the cylinder.The piston rod of this cylinder projects much more out of the same cylinder, extending on and along the support 1 Its free end inserts in a grommet 103 including a support tract that by means of one side has a depression for the insertion of a pin to fix the end of the rod, in order to become integral to it, and a tract of appropriate eyelet, with a rectilinear through hole 104 longitudinally developed, limited on its sides by edges having an elevation 105 centered in relation to l longitudinal development of the same through hole. In this hole, ratchet 106 works the interception piece. It has at the top a pin 107 that crosses transversely to rest, on two extremities projecting in diametrically opposite positions, on the edges of elevation of the eyelet. The ratchet, on the other hand, is mounted in a horizontally fixed position in a recess 108 of the support 1 ', where it is loaded to the bottom through a helical compression spring. It is evident that with this construction, the ratchet is bent to follow the profile of the edges in elevation, then to be raised / lowered with the displacement of the eye piece 103 under the operation of the above relevant air cylinder. The ratchet is actuated by an air cylinder actuated by the same open / close control of the pipe holder fastener, i.e., as mentioned above, the air source for the two cylinders is the same. FIGURE 4 shows the entire core arm assembly described with the indicated control board 300. The present invention has been described and illustrated with reference to a specific embodiment thereof, but it should be understood that variations can be made without departing from the scope of protection.

Claims (2)

1. A support arm assembly for a pipe bending machine, with a mandrel (M) for placing a pipe slidable thereon, provided with a pipe holder fastener, characterized in that it includes one or more linear flanges arranged along the length of the pipe. arm; the mandrill (M) including a piece to intercept the flanges through a ratchet connected between a raised rest position and a downward working position by the displacement of an eyelet, where it can slide, presenting the edges in elevation against which the Ratchet is loaded, under the action of a piston; an individual hydraulic or air drive or drive, simultaneously activating the opening / closing of the pipe holder fastener and the ratchet connection.

2. The support arm assembly for a pipe bending machine according to claim 1, further characterized in that the mandrel (M) includes angular, reversible flange pins with a steering cut, cooperating with a spring-loaded locator, the locator can be inserted / disinserted for right and left curves through a spindle with a cutting end driven by a lever mechanism controlled by stop lamellae arranged on a linear guide.