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Device and method for preheating plastic extruding forming molds

A technology of extrusion molding and molding die, which is applied to the device for preheating plastic extrusion molding die and the field of preheating plastic extrusion molding die, which can solve the problems of easy separation and peeling off coating, achieve stable preheating, improve stability, The effect of improving efficiency

Active Publication Date: 2020-07-28
WUHAN KINGBULL ECONOMIC DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the current chrome-plated molding mold is easily separated into peeling coatings through high-temperature baking preheating to a specified temperature, and provides a device for preheating plastic extrusion molding molds. Preheat the pre-installed molding mold, heat it from the inside out, without damaging the surface functional layer of the molding mold, and identify the molding molds of different specifications through the single-chip microcomputer of the high-frequency generator, and correspondingly set the conduction for the output of the molding mold specification The PWM signal with a time of t can heat the forming molds of different specifications to the set temperature, which solves the problem of controlling the mold preheating termination temperature according to the mold specifications, greatly reduces the heating time after the mold is installed on the production line, and improves the production efficiency. boot efficiency

Method used

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  • Device and method for preheating plastic extruding forming molds
  • Device and method for preheating plastic extruding forming molds
  • Device and method for preheating plastic extruding forming molds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as figure 1 As shown, the embodiment of the present invention provides a rapid start-up preheating equipment for plastic extrusion molds, including a high-frequency generator 1, a preheating platform 2 and a communication cable 6; the preheating platform 2 includes a plurality of specification fixtures The sheath 7 , the single-chip microcomputer 8 and the induction coil L are helically wound and embedded in the fixture sheath 7 , and are connected to the high-frequency generator 1 through the communication cable 6 .

[0049] see figure 1 As shown, the clamp sheath 7 is provided with a funnel cavity 7a inside and a trapezoidal groove 7b outside, and the inlaid induction coil L is wound in the trapezoidal groove 7b.

[0050] The high-frequency generator 1 is equipped with a power supply, and the power supply includes an AC input terminal AC220V, a filter voltage stabilization circuit, and a rectifier bridge. The AC input from the AC input terminal AC220V is filtere...

Embodiment 2

[0065] On the basis of Embodiment 1, the single-chip microcomputer 8 also measures the ambient temperature outside the funnel chamber 7a by the temperature sensor, as in Table 2, the single-chip microcomputer is based on the measured ambient temperature Th and the standard temperature T in different temperature ranges hi Calculate the compensation value s of the conduction time required by the forming mold with a diameter of dn32, and then update the conduction time t of the PWM1 and PWM2 signals by the microcontroller d , t d = t d +s, where the standard temperature T hi Including 6°C, 21°C, 29°C, 40°C;

[0066] The first temperature range is 0-6°C, s=0;

[0067] The second temperature range is from 7 to 21°C, and the compensation value s is increased by 1s for every 3°C increase in the ambient temperature;

[0068] The third temperature range is 22-29°C. For every 2°C increase in the ambient temperature, the compensation value s will be increased by 1s;

[0069] The fou...

Embodiment 3

[0078] includes the device of Example 1, but with a fixed value resistor R m replaced by common resistors such as Figure 4 a and Figure 4 b, and the coil KT of the time relay is connected in series between the voltage dividing resistor R and the ground terminal GND or the reference DC power supply VCC, and the normally closed contact KT1 of the time relay is also connected in series between the AD converter and the voltage dividing resistor R or the ground terminal GND , identifying the resistor R m When it is connected between the voltage dividing resistor R or the ground terminal GND, the single-chip microcomputer collects and identifies the resistance R through the AD converter. m Divide the voltage Vr and store the AD value. After the delay of the coil KT of the relay arrives, the normally closed contact KT1 of the time relay is disconnected, and the resistance value measured by the single-chip microcomputer changes greatly, and the single-chip microcomputer is excited...

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Abstract

The invention discloses a quick starting and preheating device for plastic extruding forming molds. The device comprises a high-frequency generator, a preheating platform and a communication cable; the mains supply can be converted into the high-frequency current ranging from 30 KHz to 40 KHz by the aid of the high-frequency generator, and a heating parameter display screen, starting and stoppingbuttons and high-frequency output ports are arranged on the front panel of the high-frequency generator; the preheating platform comprises fixture sheaths in multiple specifications, a recognition module and high-frequency cables; and the high-frequency cables are inlaid in the fixture sheaths in a spirally winding manner and are connected with the output ports of the high-frequency generator through the communication cable. According to the preheating device, through electromagnetic induction, preassembled forming molds can be preheated under a production line and are heated from inside to outside, the surface functional layers of the forming molds are not damaged, and multiple forming molds in different specifications can be preheated simultaneously by the aid of the multiple output ports of the high-frequency generator and the fixture sheaths in multiple specifications on the platform, the heating time after the molds are mounted on the production line is greatly shortened, and thestarting efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of preheating of extrusion dies, in particular to a device for preheating plastic extrusion molding dies, and also to a method for preheating plastic extrusion molding dies. Background technique [0002] The commonly used processing method for plastic pipes is screw extrusion, and the extrusion die is the guarantee of the size and processing efficiency of plastic pipes. When the processing needs to clean the molding mold, the extrusion molding mold of different sizes will be replaced or the surface will be cleaned. Cooling, after the replacement is completed, it is necessary to continue heating and waiting, and because the temperature of the forming mold is not heated evenly, a large amount of unnecessary waste products will be generated when the pipeline is extruded, resulting in a waste of production costs; the extrusion forming mold is mostly made of No. 45 low-carbon steel Or stainless steel and other w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/09B29C48/32B29C48/92B29C48/25B29L23/00
CPCB29L2023/22B29C48/09B29C48/25B29C48/32B29C48/92B29C2948/92704
Inventor 陈厚忠
Owner WUHAN KINGBULL ECONOMIC DEV
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