Twenty-five-roller stretcher for uniaxial tension of geogrid

Abstract

The invention provides a twenty-five-roller stretcher for uniaxial tension of geogrid, belonging to the processing field of plastic state materials. According to the stretcher, a multiroll type multi-point stretching manner, oil heating, whole-course chain drive are utilized, and the tension speed of the front stage and the rear stage can be adjusted by a chain wheel, so that the condition that the weight of a stretching roller is increased and the rotational inertia of the stretching roller is large after the stretching roller is fully filled with hot oil, so that a driven roller of an existing stretcher is difficult to control and is even out of control, and further the tension precision is affected can be avoided, and further various problems related to cost, processing, control and other aspects caused by gradually increased size of the rear-stage stretching roller in the prior art can be also avoided, so that plates can be stretched on each stretching roller, the multi-roller multi-point stretch is realized, the manufactured geogrid can be stretched more uniformly, the thickness of the geogrid is uniform and consistent, the molecular orientation linear distribution is uniform, and the node intensity is high; and the twenty-five-roller stretcher for the uniaxial tension of the geogrid has quite high stretch strength and stretch modulus, and technological requirements on the lateral stretching of the later-stage geogrid are met.

Description

technical field [0001] The invention is a special equipment for producing a three-dimensional three-dimensional grid screen with a certain height, which is formed by thermoplastic or molding, and specifically relates to a special stretching equipment for a plastic geogrid. Background technique [0002] Geogrid is made of polyethylene, polypropylene or high-density polymer, which is a square or rectangular mesh formed by stretching. According to the different stretching directions during its manufacture, it can be uniaxially stretched or biaxially stretched. . It is punched on the extruded sheet, and then directional stretched under heating conditions. The uniaxially stretched grid is only stretched along the length direction of the sheet, while the biaxially stretched grid is made by continuing to stretch the uniaxially stretched grid in a direction perpendicular to its length. During the manufacture of the plastic geogrid, the polymer polymers will rearrange and align wit...

AI Technical Summary

Problems solved by technology

[0005] ①. Since the stretched sheet is a single-point single-line type, the stress concentration of the sheet when the sheet is stretched causes the sheet to have internal stress, resulting in uneven stretched thickness of the sheet

[0006] ②. The crystals inside the plate are not evenly arranged, and the tensile strengths of various types are not the same. In the later stretching process of the plastic bidirectional geogrid, the uneven thickness of the grid and the difference in vertical and horizontal strength will be caused, thus affecting the overall performance

[0007] In addition, most of the existing stretching equipment uses water heating and steam heating, such as "01216991-unidirectional stretching forming device". This method will make parts in a high-temperature and humid working environment for a long time, which is easy to rust and affects normal production. , maintenance is troublesome, and high-strength corrosion-resistant materials make it costly;

[0008] In order to avoid the above problems, some stretching equipment adopts a special hot air oven for heating, such as "01216992-transverse stretch forming machine", but this kind of heating device needs to prepare matching hot air supply equipment and a special heating space, which requires a large investment. And the equipment is complicated, the cost of operation management and maintenance is high, and in the process of hot air transportation, a large amount of heat loss is inevitable in the air, resulting in waste of energy

However, if the oil heating method commonly used in other fields is used, that is, the oil pump is used to transport the hot oil in the high-temperature oil tank into the stretching roller for circulation, and the stretching roller is heated by the oil temperature. The advantage of doing this is to use the heat stored in the hot oil Large, oil temperature control is convenient, but the problem is that the weight of the stretching roller increases after it is completely filled with hot oil, and the moment of inertia is large, while the existing stretching equipment adopts the design of active stretching rollers and passive stretching rollers , the reduction device of the transmission machine is only installed on the shaft of the driving roller. When the motor of the driven roller stops, it depends on the direct or indirect friction with the driving roller. It is more difficult to control the operation of the driven roller or even out of control, thus affecting the stretching accuracy

[0009] In addition, in the existing stretching machine, in order to realize that the stretching speeds on the stretching rollers are not consistent, the method adopted is to set the diameter of the subsequent stretching roller to be larger than the diameter of the preceding stretching roller, and utilize the cylinder Under the condition of consistent rotation speed, the law of large diameter and high linear velocity can be used to realize the change of stretching speed, such as "201020654810-Geogrid stretching mechanism", but this method is likely to cause the following two shortcomings: first, the continuous Increasing the size of the post-stretching roller will continuously increase the equipment manufacturing cost and processing difficulty; secondly, if the size of the stretching roller is too large, it will also increase its moment of inertia, which is not conducive to the control of the stretching process

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