JP2000190019A - Chain drawing machine as driving unit assembly when bars and pipes are rolled or drawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To delicately adjust a clamping force against a workpiece. SOLUTION: With a chain drawing machine to roll or draw bar or pipe where load supporting rollers 8 to support segment-like drawing tools which synchronously forward along two drawing chain on one plane roll on the supporting tracks endlessly, the front working face of at least one supporting track is controlled with pressure by multiple hydraulic pistons 13 installed on the opposite side of the running support rollers 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention has a segmented extraction tool which advances synchronously along two extraction chains in one plane, the tools facing each other in an endless loop. The pull-out tool is pressed against the pull-out object and is guided so as to be driven by frictional contact, and the load-bearing rollers are supported on the track to receive the pressing force of the pull-out tool within a range where the tool comes into contact with the pipe. The present invention relates to a chain pulling machine as a drive unit assembly for rolling or drawing rods and tubes, which can be rolled at and supported by a hydraulic clamping device arranged on the other side of the bearing track.

[0002]

2. Description of the Related Art According to German Patent Application No. 2 448 157 A1, the endless track of a track pulling machine runs in a guide and forms a guide section as a support track, which support tracks are arranged on both sides of the support track. 2. Description of the Related Art Continuous withdrawal devices for tubes, in which the clamping devices are clamped together, are known. A preload spring is provided on the frame supporting the bearing track or on the hydraulic cylinder for tightening. This clamping device provides the necessary clamping force to assure the drive of the tube by bringing the drawing tool into contact with the circumference of the tube during the withdrawal of the tube.

Known devices have an expensive clamping device structure by linking piston and cylinder units, which clamp the frames to each other, to the frame of each chain rail on both sides of the pull-out chain. In this case, there is the risk of a tilt installation, ie different loads on the piston and cylinder units on both sides. In particular, no sensitive adjustment is provided for the insertion of tools (Einfaedeln) and the removal of tools (Ausfaedeln) in tubes.

[0004]

SUMMARY OF THE INVENTION The object of the invention is to depart from the prior art mentioned above, in particular with a simple structure, which allows for a sensitive adjustment of the clamping force for rolling or pulling out the drawn material. The pulling of the chain as a drive assembly during the rolling or drawing of rods and pipes, taking into account the process of inserting and removing the tools of the pipes and rods, so as not to cause any damage to the rolled or drawn material. Making machines.

[0005]

Means for Solving the Problems In order to solve this problem,
According to the invention, the at least one bearing track has a guide which incorporates a hydraulic piston of the tensioning device such that its working front is accessible on a side remote from the roller to a running rail which is deformable within limits. It is proposed to be part of the frame edge.

[0006]

At the heart of the invention is the arrangement of a hydraulic piston within a guide frame rim, a part of which is formed by the traveling rail itself. The running track is elastically deformable within a certain range so that, when the hydraulic piston of the tensioning device is loaded, it acts on the underside of the bearing track.

[0007] Particularly advantageous and simple is when the guide frame rim contains a cylinder bore for the hydraulic piston of the clamping device. In this case, the guide frame edge itself is formed as a very stable, low-deflection structural part into which the hydraulic piston is directly inserted. The tightening force and the pressing force on the extraction tool are introduced directly where they are needed, i.e. directly in the region of the bearing track cooperating with the extraction tool. As in the case of the prior art, it is unnecessary to direct the force in a circuitous manner over the frame part and the piston-cylinder unit linked thereto.

Preferably, the hydraulic pistons are connected to a common pressure medium conduit, the pressure load of which can vary depending on the working process. This measure ensures that the tool is pressed evenly onto the rolling or drawing material, in particular over the entire tightening length, ensuring a constant tightening pressure and a hydraulic piston to the drawing tool. In addition, the extraction tool and its fastening backing are supported on an elastic intermediate plate in order to compensate for manufacturing tolerances inside the running rollers, the extraction chain and the fastening backing.

Therefore, in the case of an intermittent manufacturing process, for example in the case of drawing a tube, it is necessary to avoid deformation at the beginning and end of the tube, and when the entire working range is filled with the drawn material. For the first time, the clamping pressure becomes effective. For this reason, according to a further feature of the invention, the pressure load of the hydraulic piston can be interrupted during tool insertion and tool removal of the rod or tube. If the hydraulic clamping pressure is zero, tool insertion and removal of the withdrawal is possible without damage (the clamping load only acts from the dead weight of the overdrawing chain). Despite the hydraulic piston's approaching hydraulic travel being limited to a few millimeters, it provides a complete clamping action.

The device can in particular be set up with a clamping device on one side of the withdrawal stroke, ie one bearing track is designed fixedly, while another bearing track is adjustable by the method according to the invention. It can be manufactured at low cost because it works with the hydraulic piston.

[0011] Embodiments of the present invention are illustrated and described below.

[0012]

FIG. 1 schematically shows a chain pulling machine according to the present invention. Since the two rotating chain rails 1 and 2 are arranged symmetrically, the extraction tool 3 is paired with the driving wheel 5
In the working range 4 of the machine between the wheel 6 and the turning wheel 6, the pulling force is transmitted to the pull-out 7 by friction. The drawing tool 3 is supported along running tracks 9 and 10 via running rollers 8.

The support track 9 is fixedly arranged, while the support track 10 is accessible via a piston-cylinder unit, the cylinder being formed as a bore 11 in the guide frame rim 12. A hydraulic piston 13 is provided in this hole 11.
And the piston, together with its front face 15 via a common pressure medium conduit 14, is provided with rollers 8
It is loaded so as to press the side away from it.

The same parts in FIG. 2 have the same names. In the upper region of the figure there is a fixed support track 9 on which the running rollers 8 of the extraction tool 3 roll. The running roller 8 is supported by the drawing chain 1 so as to be freely rotatable, and the chain also supports a tightening member 16 that holds the drawing tool 3. An elastic intermediate plate 17 is provided between the extraction tool 3 and the tightening member 16 so as to compensate for manufacturing tolerances. The extraction object 7 is almost completely surrounded by the inner diameter of the extraction tool, and the extraction tool 3 is pressed by the hydraulic piston 13. The hydraulic piston 13 is arranged in the bore 11 provided therein in the guide frame rim 12 and can be pressed against the lower accessible bearing track 10 by a load with a pressure medium. As a result, the bearing track 10 is raised and the rollers 8 and the elastic intermediate plate 1 are raised.
The extraction tool 3 is pressed against the tube 7 via 7. Since the upper extraction tool 3 is pressed against the fixed support track 9 via the upper roller 8, it does not escape and the necessary clamping force is transmitted to the tube.

On insertion and removal of the tube 7 from the extraction tool 3, the cylinder 11 of the hydraulic piston is unloaded from the pressure medium, so that the beginning of the tube can be introduced without problems. Only when the pipe is completely within the working range 4 of the chain drawing machine is the cylinder space 11 of the hydraulic piston 11
Are loaded with a pressure medium and provide the desired, adjustable clamping force.

[Brief description of the drawings]

FIG. 1 is a schematic view of a chain pulling machine of the present invention.

FIG. 2 is a sectional view of the chain pulling machine of the present invention, taken along section AA.

[Explanation of symbols]

 1, 2 Chain rope 3 Pulling tool 4 Mechanical working range 5 Driving wheel 6 Turning wheel 7 Pulled out 8 Running roller 9, 10 Supporting track 11 Hole 12 Guide frame rim 13 Hydraulic piston 14 Pressure medium conduit 15 Front surface 16 Fastening member 17 Elastic intermediate Board

Claims (4)

[Claims] 1. A segmented extraction tool synchronously advancing along two extraction chains lying in one plane, the tool comprising: The load-bearing roller rolls on a support track to receive the pressing force of the extraction tool within the area in which the tool contacts the tube, in such a way that it is pressed and driven by frictional sealing. In a chain pulling machine as a drive unit during rolling or drawing of rods and tubes, which can be supported by a hydraulic clamping device arranged on the other side of the track, at least one supporting track (9, 10) The hydraulic piston of the tensioning device (10) is such that its working front is accessible on a side remote from the running roller (8) to a support rail (10) which is deformable within limits. Chain drawing machine, which is a part of 3) guide frame edge having a built-in (12). 2. The chain pulling machine according to claim 1, wherein the guide frame edge (12) includes a cylinder bore (11) for the hydraulic piston (13) of the tightening device. 3. The method according to claim 1, wherein all the hydraulic pistons are connected to a common pressure medium conduit and the pressure load thereof can be varied in a process-dependent manner.
Or the chain pulling machine according to 2. 4. The chain as claimed in claim 1, wherein the pressure load on the hydraulic piston (13) can be interrupted when inserting or removing the tool from the rod or tube (7). Drawing machine.