Production technique of concave type straw back cushion

Abstract

The invention relates to the technical field of manufacturing a concave grass bedding, in particular to a manufacturing technique of a concave grass bedding. The manufacture technique comprises the steps of paving, pressing and packing; lapping amount is set to be 200-350mm; working pressure is set to be 4-5 times the supporting pressure of the grass bedding; a pressure sensor is used for measuring and displaying the pressure applied to each part of the concave grass bedding and sending the pressure to a PLC controller; the pressure applied to each part of the concave grass bedding and depressing position thereof are measured; when the grass amount paved, pressure and position are adjusted to be equal to the values set, pressure application is stopped; after pressing, the steps of packing and perforation are carried out. A fabric cover is used for wrapping the concave grass bedding of which two end parts are paved with short grass additionally; the pressure sensor is arranged in a lower mould; a limit switch is arranged on a chassis; the sensor, a control panel and the PLC controller are connected with each other. The invention provides a concave grass bedding manufacturing technique with further improved technical parameters, which automatically detects the pressure and position, can ensure safe production and produce completely qualified products.

Description

technical field [0001] The invention relates to the technical field of making concave grass mats, in particular to a manufacturing process of concave grass mats. Background technique [0002] In recent years, as concave straw mats are widely used to support steel coils in railway transportation, various inventions and creations related to concave straw mats have emerged as the times require. Invention patent 03157348.7 discloses a processing method for concave grass pads used to support steel coils, which solved the problem that there was no safe and reliable method for producing concave grass pads at that time, including the steps of laying wadding, pressing, and binding. The root of the grass is facing outward, the long grass and short grass are layered alternately, the overlap of the grass in the wadding is ≥ 50mm, and the working pressure during pressing is greater than 3 times the bearing pressure of the grass mat. The quality of the produced concave grass mat is safe ...

AI Technical Summary

Problems solved by technology

However, product quality is produced rather than inspected

Some production plants use the method of weighing and measuring with a ruler. Even if the method of weighing and measuring with a ruler is used, the humidity of the grass may be different due to climate reasons, so that the quality of the grass cannot be guaranteed to be the same, and the process of laying wadding cannot be guaranteed. The uniform distribution of the grass in the height, length and width directions of the grass support mat and the symmetrical distribution of the axial direction cannot be found by the producer during the production process.

The specifications and quality of the punched grass pads are different. On the one hand, accidents are prone to occur during railway transportation, and on the other hand, the scrap rate will remain high, resulting in economic losses for the enterprise.

[0004] 2) In the above method, the overlapping amount of the grass in the wadding is ≥ 50mm. This regulation is not reasonable. The overlapping amount of 50mm is obviously too small. In the railway transportation, due to the change of the speed, the steel coil is constantly on the grass. The two cutting surfaces of the pad groove produce impact, which makes the grass jump out from the two sides of the grass pad, and in severe cases, the grass pad will be broken, causing hidden dangers to railway transportation; the overlap of ≥50mm is uncertain

[0005] 3) In the above method, the working pressure during pressing is greater than 3 times of the load-bearing weight of the grass pad. Practice has proved that this pressure is not high enough, so that the density of the grass pad is not high enough, and the deformation of the grass pad is relatively large when loaded. Large, especially the deformation of the two cut surfaces of the grass pad groove is relatively large. During railway transportation, there is a gap between the two cut surfaces of the grass pad groove and the outer surface of the steel coil, and the steel coil is easy to shake on the pad.

In the grass mat pressed only by the perimeter grass, the density of the groove part and both ends is different, and the two cut surfaces of the groove part cannot form a straight surface, so the quality cannot meet the requirements

[0007] 5) When the grass mat is in direct contact with the steel coil, due to climate and other reasons, it is likely that grass hairs will adhere to the steel coil, which will affect the surface quality of the steel coil

When used to transport steel coils for export, it may also cause quarantine problems and affect the export of steel coils

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