Roller product with high performance and high binding power between metal insert and PU tire bead, prepared by injection molding method

A metal and roller technology, applied in the field of polyurethane roller and its injection molding process, can solve the problems of high material cost, high labor cost, low production efficiency, etc., and achieve the effect of improving the bonding performance

Active Publication Date: 2013-10-02
EHC ELEVATOR RAIL SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] 1) The cost of equipment is high, and the cost of low-pressure pouring equipment is 700,000-800,000 yuan / set; in addition, such as preheating oven, oven, vacuum defoaming machine, nitrogen injection machine, pre-mixer and other additional components, the equipment cost is usually 110- 1.2 million yuan / set;
[0021] 2) The production efficiency is low. It takes 20-25 minutes / cycle for the curing and molding of polyurethane in the pouring process, and the output of a pouring production line is 550-570 pieces / shift (8-hour working system);
[0022] 3) High labor cost: 4-5 operators;
[0023] 4) High cost of materials: At present, the price of polyether TDI polyurethane prepolymer, a common material for thermosetting polyurethane, is 50-85 yuan / kg
[0024] The purpose of the present invention is to overcome the respective deficiencies of preparing roller products by traditional injection molding and casting techniques, such as the bead and metal hub of polyurethane rollers produced by traditional injection molding techniques have no cohesive force, and the production efficiency of traditional casting techniques is low, equipment, materials and labor costs are higher

Method used

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  • Roller product with high performance and high binding power between metal insert and PU tire bead, prepared by injection molding method
  • Roller product with high performance and high binding power between metal insert and PU tire bead, prepared by injection molding method
  • Roller product with high performance and high binding power between metal insert and PU tire bead, prepared by injection molding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Prepare polyurethane rollers without bearings, including the following steps:

[0067] 1) Pre-sandblasting and roughening the glue-sprayed surface of the metal hub;

[0068] 2), carry out surface degreasing and cleaning operation to the metal wheel hub that step 1) obtains;

[0069] 3), the glue-spraying surface of the metal wheel hub obtained in step 2) is pre-sprayed with a high-temperature reactive adhesive;

[0070] 4), the pre-sprayed metal hub obtained in step 3) is preliminarily dried for 2-3 hours in an environment of 5-30°C under a humidity of ≤75%;

[0071] 5), preheating the preliminary dried pre-sprayed metal hub obtained in step 4) at 110-120° C. for 2-10 hours;

[0072] 6) Put the metal hub pre-sprayed with adhesive obtained in step 5) into the injection mold cavity for positioning and fixing, then close the mold, and then use a 160-260T low-pressure injection molding machine to inject liquid thermoplastic polyurethane material from the pouring machine s...

Embodiment 2

[0075] Prepare the polyurethane roller of the aluminum alloy wheel hub with bearing, comprise the following steps:

[0076] 1) Pre-blasting and roughening the glue-sprayed surface of the aluminum alloy wheel with quartz sand;

[0077] 2), using an automatic water cleaning machine to carry out surface degreasing and cleaning operations on the metal wheel hub obtained in step 1);

[0078] 3), the glue-spraying surface of the metal wheel hub obtained in step 2) is pre-sprayed with a high-temperature reactive adhesive of British Sibang 49C;

[0079] 4), the pre-sprayed metal wheel hub obtained in step 3) is preliminarily dried for 2-3 hours in an environment of 5-30°C at a humidity of <75%;

[0080] 5), put the preliminary dried pre-sprayed metal hub obtained in step 4) into an oven at 110-120° C., and preheat for 2-10 hours;

[0081] 6) Put the metal hub pre-sprayed with adhesive obtained in step 5) into the injection mold cavity for positioning and fixing, then close the mold,...

Embodiment 3

[0085] Prepare polyurethane rollers without bearings, including the following steps:

[0086] 1) Pre-sandblasting and roughening the glue-sprayed surface of the metal hub;

[0087] 2), carry out surface degreasing and cleaning operation to the metal wheel hub that step 1) obtains;

[0088] 3), the glue-spraying surface of the metal wheel hub obtained in step 2) is pre-sprayed with a high-temperature reactive adhesive;

[0089] 4), the pre-sprayed metal hub obtained in step 3) is preliminarily dried for 2-3 hours in an environment of 5-30°C under a humidity of ≤75%;

[0090] 5), preheating the preliminary dried pre-sprayed metal hub obtained in step 4) at 110-120° C. for 2-10 hours;

[0091] 6) Put the metal hub pre-sprayed with adhesive obtained in step 5) into the injection mold cavity for positioning and fixing, then close the mold, and then use a 160-260T low-pressure injection molding machine to inject liquid thermoplastic polyurethane material from the pouring machine scr...

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Abstract

The invention relates to an injection molding process for manufacturing a roller product with high performance and high binding performance between a PU tire bead and a metal wheel hub. The injection process is widely applied in the fields of escalator rollera, door hanging wheels, etc.

Description

technical field [0001] The invention relates to a polyurethane roller and its injection molding process. The roller product prepared by the injection molding process has good bonding performance between the polyurethane bead and the metal hub, and is widely used in the fields of escalator rollers, door hanging wheels and the like. Background technique [0002] At present, there are two traditional process methods for manufacturing polyurethane rollers: injection molding process and casting process. [0003] The general procedure of the injection molding process is: first use thermoplastic polyurethane particles to inject and roll the tire bead, and then insert the wheel hub into the polyurethane bead through the interference pressure of the low-pressure machine, so that the bead tightly wraps the wheel hub, so as to make the roller; among them, thermoplastic polyurethane can be made of polyester. Ester MDI + anti-hydrolysis agent thermoplastic polyurethane particles, the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/14B29C45/76B29B13/00B29B13/06
Inventor 李家珍张一鹏
Owner EHC ELEVATOR RAIL SHANGHAI CO LTD
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