CN201004189Y

CN201004189Y - Quick temperature increase environment protection wave peak welding control device

Info

Publication number: CN201004189Y
Application number: CNU2007200623239U
Authority: CN
Inventors: 胡汉辉
Original assignee: Hunan Industry Polytechnic
Current assignee: Hunan Industry Polytechnic
Priority date: 2007-01-29
Filing date: 2007-01-29
Publication date: 2008-01-09
Anticipated expiration: 2017-01-29

Abstract

The utility model discloses a rapid temperature rising and environmental friendly wave crest welding temperature control device, comprising an industrial personal computer, a temperature measuring circuit, a programmable controller, a pulse driving circuit, a heating circuit and an alarming circuit etc.; wherein wave crest welding temperature can be read through the temperature input module of the programmable controller first and then is transmitted to the industrial personal computer in a communication way, and then the industrial personal computer decides to carry on blur temperature control arithmetic or PID temperature control arithmetic according to preset temperature and present temperature, thus the wave crest welding temperature is rapidly controlled with high precision. The utility model is also characterized in that: able to present a temperature curve, store the temperature curve, easy to be operated and adjusted and having a direct human-machine screen; moreover, the utility model is high in wave crest welding temperature control precision and rapid in temperature control.

Description

Rapid warm raising environment-friendly type wave-soldering attemperating unit

Technical field

The utility model relates to a kind of attemperating unit, particularly a kind of rapid warm raising environment-friendly type wave-soldering attemperating unit that is widely used in the industry circuit board wave-solderings such as electronics, communication.

Technical background

A large amount of developments along with unleaded crest welder, past, unleaded crest welder control algolithm was simpler, temperature control precision is not high, there is not the parameter memory function, can not carry out temperature control according to the welding temperature curve of manufacturing enterprise's regulation, increased equipment debugging difficulty and debug time, welding quality too relies on operating personnel's experience and level, and it is serious day by day that welding quality is difficult to problems such as assurance.And if unleaded wave-soldering temperature control is not quick, welding efficiency will be descended, if temperature control precision is not high, will produce that solder joint is rough, weld defectss such as rosin joint, bubble, company's tin, tin sticky are bad, wiring board warpage, have a strong impact on the electronic product quality.

The utility model content

For overcoming the technical matters that the temperature control rate is slow, control accuracy is relatively poor of existing unleaded crest welder, the utility model provides a kind of rapid warm raising environment-friendly type wave-soldering attemperating unit.It utilizes industrial computer and Programmable Logic Controller to realize control to the body of heater well heater reaching the purpose that the actual temperature curve is followed the preset temperature curve by real-time monitoring furnace body temperature.

The technical scheme that the utility model solves the problems of the technologies described above comprises:

Industrial computer links to each other with Programmable Logic Controller, is used to provide man-machine interface, reads temperature signal that Programmable Logic Controller sends here and this temperature and predetermined threshold value temperature compared and decide control algolithm, the output temperature control signal;

Temperature measuring circuit links to each other with cold junction compensation circuit, Programmable Logic Controller respectively, is used to measure the furnace body temperature of wave soldering device, and is sent to Programmable Logic Controller;

Programmable Logic Controller is used to receive the temperature signal of temperature measuring circuit and is transformed to the engineering value and gives industrial computer, receives the industrial computer temperature control signals simultaneously and sends pulse control signal;

Pulse driving circuit links to each other with Programmable Logic Controller, heater circuit, is used for pulse control signal with Programmable Logic Controller output and is amplified and give heater circuit;

Heater circuit links to each other with pulse driving circuit, and control heater work under the output signal control of pulse driving circuit heats up body of heater or cooling;

Warning circuit links to each other with Programmable Logic Controller, carries out temperature over-range under the alerting signal effect of Programmable Logic Controller output and reports to the police.

Principle of work of the present utility model:

Temperature measuring circuit is distributed in a plurality of positions of wave-soldering body of heater, measure body of heater each point temperature in real time and this temperature signal is become resistance signal by temperature measuring circuit and deliver to Programmable Logic Controller temperature input end, Programmable Logic Controller is given industrial computer after temperature signal is become the engineering value through scale transformation, the temperature that industrial computer is sent setting threshold temperature and Programmable Logic Controller here compares, if furnace body temperature blurs temperature control algorithm than low more just execution of predetermined threshold value temperature, and give Programmable Logic Controller according to fuzzy temperature control algorithm output temperature control signal, Programmable Logic Controller is output temperature pulse control signal control heater in view of the above, furnace body temperature is risen rapidly, raising system rapidity, when furnace body temperature during near the predetermined threshold value temperature, industrial computer is just carried out the PID temperature control algorithm, and give Programmable Logic Controller according to PID temperature control algorithm output temperature control signal, Programmable Logic Controller is output temperature pulse control signal control heater in view of the above, makes system's temperature control more accurate.

The utility model possesses following advantage owing to adopt technique scheme: 1) stable and reliable operation, operation are debugged easy.2) temperature rise is quick, temperature-controlled precision is high, have temperature curve setting and memory function.3) mode that adopts Programmable Logic Controller and industrial computer to combine had both been brought into play the advantage that industrial computer makes things convenient for implementation algorithm, and it is strong to bring into play the Programmable Logic Controller antijamming capability again, reduced the advantage of the jamproof pressure of AI/AO in the computing machine.

Below in conjunction with the drawings and specific embodiments the utility model is further described.

Description of drawings

Fig. 1 is the structured flowchart of the utility model device.

Fig. 2 is well heater electrical schematic diagram figure of the present utility model.

Fig. 3 is an electrical schematic diagram of the present utility model.

Embodiment

As shown in Figure 1, be the structured flowchart of realizing the utility model device.Comprise industrial computer, Programmable Logic Controller, temperature measuring circuit, the temperature control pulse driving circuit, well heater, warning circuit, temperature measuring circuit is measured furnace body temperature and is offered Programmable Logic Controller, the signal that Programmable Logic Controller is exported according to temperature measuring circuit carries out scale transformation and becomes the engineering value and be transported to industrial computer, industrial computer compares and determines to adopt fuzzy temperature control algorithm or PID temperature control algorithm with the temperature signal and the preset temperature of Programmable Logic Controller output, output signal to Programmable Logic Controller according to selected control algolithm calculating, Programmable Logic Controller is then given the temperature control pulse driving circuit according to the temperature control signals output temperature control pulse signal of industrial computer output, the temperature control pulse driving circuit outputs to well heater after the temperature control pulse signal is amplified, the control variation of temperature.Simultaneously, if furnace body temperature transfinites, Programmable Logic Controller is sent alerting signal and is realized sound and light alarm to warning circuit.

As shown in Figure 2, the realization of heater heats: if the temperature of preheating zone is low more more than preset temperature, industrial computer sends temperature control signals, Programmable Logic Controller makes SSR1, SSR2 conducting according to the control of this signal output temperature control pulse signal SSR1, SSR2, the preheating 1-1 of well heater, the preheating 1-2 heating of switching on, the control temperature rises, otherwise then SSR1, SSR2 are by, the preheating 1-1 of well heater, preheating 1-2 outage, and the control temperature descends.Other warm area control principles are identical.

As shown in Figure 3, thermopair T1, T2, T3 record tin stove, body of heater preheating 1 district respectively and body of heater preheating 2 district's temperature are sent into Siemens S7-200 programmable temp testing module and carried out scale transformation after RS232 is uploaded to industrial computer through (A+, A-), (B+, B-), (C+, C-) in the utility model.The temperature control signals that the while Programmable Logic Controller is sent here according to industrial computer is given temperature control driving circuit SSR1, SSR2 and SSR3, SSR4 by Q0.7 and Q1.0 output temperature control wave, thus control body of heater preheating 1 district and body of heater preheating 2 district's temperature.Q0.6 output temperature control wave controls the tin furnace temperature for temperature control driving circuit SSR5, SSR6, SSR7.When temperature over-range, Programmable Logic Controller to audible-visual annunciator L1, is realized sound and light alarm by Q0.4 output sound and light alarm signal.

Claims

1, a kind of rapid warm raising environment-friendly type wave-soldering attemperating unit, it is characterized in that: comprise industrial computer, temperature measuring circuit, Programmable Logic Controller, pulse driving circuit, heater circuit, warning circuit, described industrial computer links to each other with Programmable Logic Controller, be used to provide man-machine interface, read temperature signal that Programmable Logic Controller sends here and this temperature and predetermined threshold value temperature compared and decide control algolithm, the output temperature control signal; Temperature measuring circuit links to each other with Programmable Logic Controller, is used to measure the furnace body temperature of wave soldering device, and is sent to Programmable Logic Controller; Programmable Logic Controller is used to receive the temperature signal of temperature measuring circuit and is transformed to the engineering value and gives industrial computer, receives the industrial computer temperature control signals simultaneously and sends pulse control signal; Pulse driving circuit links to each other with Programmable Logic Controller, heater circuit, is used for pulse control signal with Programmable Logic Controller output and is amplified and give heater circuit; Heater circuit links to each other with pulse driving circuit, and control heater work under the output signal control of pulse driving circuit heats up body of heater or cooling; Warning circuit links to each other with Programmable Logic Controller, carries out temperature over-range and report to the police under the alerting signal effect of programmable controller output.